Some basic CAPAB parsing. Checks if you can have vhosts, watch, silence and +q and +a

Some basic CAPAB parsing. Checks if you can have vhosts, watch, silence and +q and +a
this still won't work in unrealircd.
Other than that it's got to be quite stable in insp and can work with a very
minimal setup (requires m_spanningtree.so (for linking) and m_services-account.so for +r)

git-svn-id: http://svn.tabris.net/repos/srsv@3538 70d4eda1-72e9-0310-a436-91e5bd24443c