Remove the per dungeon level door limit

Number of doors in a room-and-corridor style level was fixed
at 120; now the doors-array is dynamically allocated when needed.

Breaks saves and bones.

include/decl.h

@@ -817,7 +817,8 @@ struct instance_globals {
     char toplines[TBUFSZ];
     coord bhitpos; /* place where throw or zap hits or stops */
     boolean in_steed_dismounting;
-    coord doors[DOORMAX];
+    int doors_alloc; /* doors-array allocated size */
+    coord *doors; /* array of door locations */
     struct menucoloring *menu_colorings;
     schar lastseentyp[COLNO][ROWNO]; /* last seen/touched dungeon typ */
     struct spell spl_book[MAXSPELL + 1];

include/global.h

@@ -400,7 +400,7 @@ extern struct nomakedefs_s nomakedefs;
 
 #define MAXNROFROOMS 40 /* max number of rooms per level */
 #define MAX_SUBROOMS 24 /* max # of subrooms in a given room */
-#define DOORMAX 120     /* max number of doors per level */
+#define DOORINC 120     /* number of doors per level, increment */
 
 #define BUFSZ 256  /* for getlin buffers */
 #define QBUFSZ 128 /* for building question text */

include/mkroom.h

@@ -16,7 +16,7 @@ struct mkroom {
     schar needfill;       /* sp_lev: does the room need filling? */
     boolean needjoining;  /* sp_lev: should the room connect to others? */
     schar doorct;         /* door count */
-    schar fdoor;          /* index for the first door of the room */
+    int   fdoor;          /* index for the first door of the room */
     schar nsubrooms;      /* number of subrooms */
     boolean irregular;    /* true if room is non-rectangular */
     schar roomnoidx;

include/patchlevel.h

@@ -17,7 +17,7 @@
  * Incrementing EDITLEVEL can be used to force invalidation of old bones
  * and save files.
  */
-#define EDITLEVEL 62
+#define EDITLEVEL 63
 
 /*
  * Development status possibilities.