allow version.h to declare a future version that is compatible with the current code as MAX_VERSION that save.c will accept.

src/buildno.h

@@ -1,3 +1,3 @@
 #define VERSION_MAJOR 3
-#define VERSION_MINOR 4
-#define VERSION_BUILD 5
+#define VERSION_MINOR 5
+#define VERSION_BUILD 0

src/kernel/save.c

@@ -1385,7 +1385,7 @@ int readgame(const char *filename, int backup)
         assert(stream_version == STREAM_VERSION || !"unsupported data format");
     }
     assert(gdata.version >= MIN_VERSION || !"unsupported data format");
-    assert(gdata.version <= RELEASE_VERSION || !"unsupported data format");
+    assert(gdata.version <= MAX_VERSION || !"unsupported data format");
 
     gdata.encoding = enc_gamedata;
     fstream_init(&strm, F);

src/kernel/version.h

@@ -30,7 +30,8 @@
 #define AUTO_RACENAME_VERSION 345 /* NPC units with name==NULL will automatically get their race for a name */
 #define JSON_REPORT_VERSION 346 /* bit 3 in f->options flags the json report */
 
-#define MIN_VERSION INTPAK_VERSION      /* minimal datafile we support */
 #define RELEASE_VERSION JSON_REPORT_VERSION /* current datafile */
+#define MIN_VERSION INTPAK_VERSION      /* minimal datafile we support */
+#define MAX_VERSION RELEASE_VERSION /* change this if we can need to read the future datafile, and we can do so */
 
 #define STREAM_VERSION 2 /* internal encoding of binary files */

src/move.c

@@ -316,7 +316,7 @@ int walkingcapacity(const struct unit *u)
     if (rbelt) {
         int belts = i_get(u->items, rbelt->itype);
         if (belts) {
-            int multi = get_param_flt(global.parameters, "rules.trollbelt.multiplier", STRENGTHMULTIPLIER);
+            int multi = get_param_int(global.parameters, "rules.trollbelt.multiplier", STRENGTHMULTIPLIER);
             n += _min(people, belts) * (multi - 1) * u_race(u)->capacity;
         }
     }