[MOST IMPORTANT] Interface EAX and LKH via C(++) interface

[jakobbossek]

Eventually, we need to interface those solvers via R's C/C++ interface instead of calling them by plain system calls. Actually, after 5 years I had to cope with a weird issue one more time.

x = "path/to/regular/tsp/instance.tsp"
r = runSolver("eax", x, solver.pars = list(cutoff.time = 2))
sh: line 1: 58008 Abort trap: 6           '/Users/bossek/repos/research/tsp/TSPAS/solvers/EAX/main' 1 filedcd134cbf3a6.out 100 30 /Users/bossek/repos/research/tsp/TSPAS/instances/evolved1000/eax---lkh---sophisticated/1000-10.tsp 0 2 8701 0 0 1 0 > /dev/null 2> /dev/null
Fehler in file(file.sol, "r") : kann Verbindung nicht öffnen
Zusätzlich: Warnmeldung:
In file(file.sol, "r") :
  kann Datei 'filedcd134cbf3a6.out_BestSol' nicht öffnen: No such file or directory

Actually, the reason for the crash was that the NAME field in the file WAS TOO LONG! The following is an excerpts from EAX to import TSPlib instances. Here, the 'word' string is limited to 80 chars and everything above leads to a crash! Who decided to go for this restriction to 80 chars!? Took me >1h of lifetime to figure this one out.

char word[ 80 ], type[ 80 ];
...

  ////// read instance //////
  while( 1 ){
    if( fscanf( fp, "%s", word ) == EOF )
...