simple fix for "Unable to make version backup" warning when saving files. missing a return.

For *nix sustems, recent physics pointcache refactor uses stdio.h's remove() rather then system("rm -f ...") for removing files, since it was a lot slower for removing pointcache.

Ton used the system command because there was some problem using remove() ~6years back, but he cant remember why, (maybe its not a problem now)

Simple error, remove wasn't returning a value, but keep an eye out for problems removing files, and if anyone can reproduce the "Unable to make version backup" problem when saving, we should look into it.

Also added a note about using # in the output path for blenders command line help text.

source/blender/blenlib/intern/fileops.c

@@ -339,7 +339,9 @@ int BLI_delete(char *file, int dir, int recursive)
 			sprintf(str, "/bin/rmdir \"%s\"", file);
 			return system(str);
 		}
-		else remove(file); //sprintf(str, "/bin/rm -f \"%s\"", file);
+		else {
+			return remove(file); //sprintf(str, "/bin/rm -f \"%s\"", file);
+		}
 	}
 	return -1;
 }

source/creator/creator.c

@@ -185,6 +185,10 @@ static void print_help(void)
 	printf ("    -o <path>\tSet the render path and file name.\n");
 	printf ("      Use // at the start of the path to\n");
 	printf ("        render relative to the blend file.\n");
+	printf ("      The # characters are replaced by the frame number, and used to define zero padding.\n");
+	printf ("        ani_##_test.png becomes ani_01_test.png\n");
+	printf ("        test-######.png becomes test-000001.png\n");
+	printf ("        When the filename has no #, The suffix #### is added to the filename\n");
 	printf ("      The frame number will be added at the end of the filename.\n");
 	printf ("      eg: blender -b foobar.blend -o //render_ -F PNG -x 1 -a\n");
 	printf ("\nFormat options:\n");