Double the max-length of internal codes, prefixes, and suffixes

So extended internal codes (e.g. for msg and file areas) now have a max length
of 32 chars (16 prefix, 16 suffix) and most other internal codes are now
limited to 16 chars (instead of 8).

src/sbbs3/sbbsdefs.h

@@ -92,8 +92,7 @@
 #define LEN_DIR		63		/* Maximum length of directory paths		*/
 #define LEN_CMD		63		/* Maximum length of command lines			*/
 
-							/* MS-DOS limited values					*/
-#define LEN_CODE	8		/* Maximum length of internal codes			*/
+#define LEN_CODE	16		/* Maximum length of internal codes			*/
 #define LEN_QWKID	8		/* Maximum length of QWK-ID					*/
 #define LEN_MODNAME 8		/* Maximum length of loadable module name	*/
 #define LEN_SIFNAME 8		/* Maximum length of SIF filename			*/

src/sbbs3/scfg/scfgmsg.c

@@ -486,7 +486,7 @@ void msgs_cfg()
 		"constructed from a combination of the prefix and the specified code \n"
 		"suffix for each sub-board.\n"
 		"\n"
-		"Code prefixes may contain up to 8 legal filename characters.\n"
+		"Code prefixes may contain up to 16 legal filename characters.\n"
 		"\n"
 		"Code prefixes should be unique among the message groups on the system.\n"
 		"\n"

src/sbbs3/scfg/scfgxfr2.c

@@ -252,7 +252,7 @@ void xfer_cfg()
 		"constructed from a combination of the prefix and the specified code\n"
 		"suffix for each directory.\n"
 		"\n"
-		"Code prefixes may contain up to 8 legal filename characters.\n"
+		"Code prefixes may contain up to 16 legal filename characters.\n"
 		"\n"
 		"Code prefixes should be unique among the file libraries on the system.\n"
 		"\n"