Scripts in menus:

- now the file .Bpymenus is in ~/.blender/, please delete the old one
- both ~/.blender/scripts/ and (if set) user pref scripts dir are scanned for scripts
- 2 scripts of the same group with the same name, one in each dir: user pref overwrites the other's entry
- fixed the problem with trailing backslash, was my fault (used NULL instead of "/" for relbase in BLI_make_file_string
- slightly changed msgs to be less verbose and parsing to be more forgiving
- if a script registers with a wrong group, 'Misc' is used instead
- 'Blender' tag is now checked, gives a warning (notice) msg if script is newer than Blender program

Blender.NMesh module and doc:
- added vertex.sel var to get/set selection state of vertex.

source/blender/python/BPY_interface.c

@@ -205,7 +205,7 @@ void init_syspath(void)
   else
     printf ("Warning: could not determine argv[0] path\n");
 
-  if (U.pythondir && strcmp(U.pythondir, "")) {
+  if (U.pythondir && U.pythondir[0] != '\0') {
     p = Py_BuildValue("s", U.pythondir);
     syspath_append(p);  /* append to module search path */
   }
@@ -480,6 +480,7 @@ int BPY_menu_do_python(short menutype, int event)
 	FILE *fp = NULL;
 	char *buffer;
 	char filestr[FILE_MAXDIR+FILE_MAXFILE];
+	char dirname[FILE_MAXDIR];
 	Script *script = G.main->script.first;
 	int len;
 
@@ -495,6 +496,10 @@ int BPY_menu_do_python(short menutype, int event)
 
 	if (!pym) return 0;
 
+	if (pym->version > G.version)
+		notice ("Version mismatch: script was written for Blender %d. "
+						"It may fail with yours: %d.", pym->version, G.version);
+
 /* if there are submenus, let the user choose one from a pupmenu that we
  * create here.*/
 	pysm = pym->submenus;
@@ -521,7 +526,13 @@ int BPY_menu_do_python(short menutype, int event)
 		pyarg = Py_None;
 	}
 
-	BLI_make_file_string(NULL, filestr, U.pythondir, pym->filename);
+	if (pym->dir) /* script is in U.pythondir */
+		BLI_make_file_string("/", filestr, U.pythondir, pym->filename);
+	else { /* script is in ~/.blender/scripts/ */
+		BLI_make_file_string("/", dirname, BLI_gethome(), ".blender/scripts");
+		BLI_make_file_string("/", filestr, dirname,	pym->filename);
+	}
+
 	fp = fopen(filestr, "r");
 	if (!fp) { /* later also support userhome/.blender/scripts/ or whatever */
 		printf("Error loading script: couldn't open file %s\n", filestr);