add function define in proto.h to avoid warning
1. use setupmailusage instead touchmailusage
Merge bbs merge module

usage:   make -D BBSMERGE  to enable this module
Some functions in cache are never used in mbbsd.
Parse a little TELNET control string.
Support big screen on telnet connection.
Fix some compile warning and make error.
Check window size in telnet.
Reverting revision 2098 and 2100. These make kernel panic due to out of swap.
bug fixed : 
PERM_BOARD can't setup the boards
PERM_ACCOUNT can't setup the account
merge the branch from ptt.fpg
merge the branch from ptt.fpg
1. fix typo in chinese.
2. fix the problem that board name in fpg has the initial number.
set extra mail box limit as MAX_EXKEEPMAIL
GO game merged from FPG.
correcting go's output
fix bug in sending a mail in userlist
fix UPPER/LOWER case problem when register.
correcting mode strings.
No talk request when playing go and dark.
reindent