Remove the hardcoded (and apparently arbitrary) cap on oter_id

overmap.cpp

@@ -134,8 +134,6 @@ overmap::overmap()
 , nullstr("")
{
// debugmsg("Warning - null overmap!");
 if (num_ter_types > 256 - 32)
  debugmsg("More than 256 - 32 oterid!  Saving won't work!");
}

overmap::overmap(game *g, int x, int y)
@@ -151,10 +149,6 @@ overmap::overmap(game *g, int x, int y)
  debugmsg("Attempting to load overmap for unknown player!  Saving won't work!");
 }

 if (num_ter_types > 256 - 32) {
  debugmsg("More than 256 - 32 oterid!  Saving won't work!");
 }

 if (g->has_gametype()) {
  prefix = special_game_name(g->gametype());
 }
@@ -2661,7 +2655,7 @@ void overmap::save()
  fout << "L " << z << std::endl;
  for (int j = 0; j < OMAPY; j++) {
   for (int i = 0; i < OMAPX; i++) {
    fout << char(int(layer[z].terrain[i][j]) + 32);
    fout << int(layer[z].terrain[i][j]) + 32;
   }
   fout << std::endl;
  }
@@ -2716,7 +2710,7 @@ void overmap::open(game *g)
     getline(fin, dataline);
     if (z >= 0 && z < OVERMAP_LAYERS) {
      for (int i = 0; i < OMAPX; i++) {
       layer[z].terrain[i][j] = oter_id((unsigned char)dataline[i] - 32);
       layer[z].terrain[i][j] = oter_id(dataline[i] - 32);
       layer[z].visible[i][j] = false;
       if (layer[z].terrain[i][j] < 0 || layer[z].terrain[i][j] > num_ter_types)
        debugmsg("Loaded bad ter!  %s; ter %d", terfilename.c_str(), layer[z].terrain[i][j]);