Eliminate some unnecessary macros

[busstoptaktik]

The "error return macros" defined in projects.h are mostly unnecessary and makes the code harder to read.

They are used all in all 157 times all over the code base. I suggest to eliminate them (this is seconded by @kbevers in comments to pull request #431 )

# define E_ERROR(err) { pj_ctx_set_errno( P->ctx, err); freeup(P); return(0); }
# define E_ERROR_0 { freeup(P); return(0); }
# define F_ERROR { pj_ctx_set_errno( P->ctx, -20); return(xy); }
# define F3_ERROR { pj_ctx_set_errno( P->ctx, -20); return(xyz); }
# define I_ERROR { pj_ctx_set_errno( P->ctx, -20); return(lp); }
# define I3_ERROR { pj_ctx_set_errno( P->ctx, -20); return(lpz); }