Fix compilation warnings

[Florents-Tselai]

They've been fine up until now, but with #6 they are - and should - be treated as errors

[Florents-Tselai]

src/mine.c:46:6: warning: no previous prototype for function 'quicksort' [-Wmissing-prototypes]
void quicksort(double *a, int *idx, int l, int u)
     ^
src/mine.c:46:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void quicksort(double *a, int *idx, int l, int u)
^
static 
src/mine.c:84:6: warning: no previous prototype for function 'argsort' [-Wmissing-prototypes]
int *argsort(double *a, int n)
     ^
src/mine.c:84:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int *argsort(double *a, int n)
^
static 
src/mine.c:125:8: warning: no previous prototype for function 'hq' [-Wmissing-prototypes]
double hq(int **cumhist, double **cumhist_log, int q, int p, int n)
       ^
src/mine.c:125:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
double hq(int **cumhist, double **cumhist_log, int q, int p, int n)
^
static 
src/mine.c:156:8: warning: no previous prototype for function 'hp3' [-Wmissing-prototypes]
double hp3(int *c, double *c_log, int s, int t)
       ^
src/mine.c:156:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
double hp3(int *c, double *c_log, int s, int t)
^
static 
src/mine.c:199:8: warning: no previous prototype for function 'hp3q' [-Wmissing-prototypes]
double hp3q(int **cumhist, double **cumhist_log, int *c, int q, int p, int s, int t)
       ^
src/mine.c:199:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
double hp3q(int **cumhist, double **cumhist_log, int *c, int q, int p, int s, int t)
^
static 
src/mine.c:243:8: warning: no previous prototype for function 'hp2q' [-Wmissing-prototypes]
double hp2q(int **cumhist, int *c, int q, int p, int s, int t)
       ^
src/mine.c:243:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
double hp2q(int **cumhist, int *c, int q, int p, int s, int t)
^
static 
src/mine.c:283:5: warning: no previous prototype for function 'EquipartitionYAxis' [-Wmissing-prototypes]
int EquipartitionYAxis(double *dy, int n, int y, int *Q_map, int *q)
    ^
src/mine.c:283:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int EquipartitionYAxis(double *dy, int n, int y, int *Q_map, int *q)
^
static 
src/mine.c:343:5: warning: no previous prototype for function 'GetClumpsPartition' [-Wmissing-prototypes]
int GetClumpsPartition(double *dx, int n, int *Q_map, int *P_map, int *p)
    ^
src/mine.c:343:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int GetClumpsPartition(double *dx, int n, int *Q_map, int *P_map, int *p)
^
static 
src/mine.c:414:5: warning: no previous prototype for function 'GetSuperclumpsPartition' [-Wmissing-prototypes]
int GetSuperclumpsPartition(double *dx, int n, int k_hat, int *Q_map,
    ^
src/mine.c:414:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int GetSuperclumpsPartition(double *dx, int n, int k_hat, int *Q_map,
^
static 
src/mine.c:445:6: warning: no previous prototype for function 'compute_c' [-Wmissing-prototypes]
int *compute_c(int *P_map, int p, int n)
     ^
src/mine.c:445:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int *compute_c(int *P_map, int p, int n)
^
static 
src/mine.c:468:9: warning: no previous prototype for function 'compute_c_log' [-Wmissing-prototypes]
double *compute_c_log(int *c, int p)
        ^
src/mine.c:468:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
double *compute_c_log(int *c, int p)
^
static 
src/mine.c:488:7: warning: no previous prototype for function 'compute_cumhist' [-Wmissing-prototypes]
int **compute_cumhist(int *Q_map, int q, int *P_map, int p, int n)
      ^
src/mine.c:488:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int **compute_cumhist(int *Q_map, int q, int *P_map, int p, int n)
^
static 
src/mine.c:525:11: warning: no previous prototype for function 'compute_cumhist_log' [-Wmissing-prototypes]
double ** compute_cumhist_log(int **cumhist, int q, int p)
          ^
src/mine.c:525:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
double ** compute_cumhist_log(int **cumhist, int q, int p)
^
static 
src/mine.c:558:10: warning: no previous prototype for function 'init_I' [-Wmissing-prototypes]
double **init_I(int p, int x)
         ^
src/mine.c:558:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
double **init_I(int p, int x)
^
static 
src/mine.c:588:10: warning: no previous prototype for function 'compute_HP2Q' [-Wmissing-prototypes]
double **compute_HP2Q(int **cumhist, int*c, int q, int p)
         ^
src/mine.c:588:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
double **compute_HP2Q(int **cumhist, int*c, int q, int p)
^
static 
src/mine.c:637:5: warning: no previous prototype for function 'OptimizeXAxis' [-Wmissing-prototypes]
int OptimizeXAxis(double *dx, double *dy, int n, int *Q_map, int q,
    ^
src/mine.c:637:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int OptimizeXAxis(double *dx, double *dy, int n, int *Q_map, int q,
^
static 
src/mine.c:784:13: warning: no previous prototype for function 'init_score' [-Wmissing-prototypes]
mine_score *init_score(mine_problem *prob, mine_parameter *param)
            ^
src/mine.c:784:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
mine_score *init_score(mine_problem *prob, mine_parameter *param)
^
static 
17 warnings generated.
src/vasco.c:228:15: warning: mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
    TupleDesc resultTupleDesc;
              ^
src/vasco.c:264:11: warning: variable 'n' set but not used [-Wunused-but-set-variable]
    Datum n, x, y;
          ^

[Florents-Tselai]

Extracting headers for this, can help with #4 too.

[Florents-Tselai]

Also see #11