Author: Perry Lorier <isomer@undernet.org>

Log message:

Try and fix issues with large numbers of invisible (or non invisible) users.
Do this by always calling set_user_mode() for all mode setting/unsetting.
This requires an extra flag so we can limit which userflags can be set in
some situations.

git-svn-id: file:///home/klmitch/undernet-ircu/undernet-ircu-svn/ircu2/branches/u2_10_12_branch@1818 c9e4aea6-c8fd-4c43-8297-357d70d61c8c