Raise CHANNELLEN to the maximum of 200 chars defined by rfc1459

[michaelortmann]

Found by: pseudo (see #38)
Patch by: michaelortmann
Fixes: #38

One-line summary:
Raise CHANNELLEN to the maximum of 200 chars defined by rfc1459 and used by networks like undernet

Additional description (if needed):
Its a big bad bug to if eggdrop cant deal with channels with channelnames longer than 80 chars.

Test cases demonstrating functionality (if applicable):
At least themajor network undernet supports the max channel name len of 200.

[vanosg]

Not specifically addressed in this PR but maybe missed when this was implemented- based on the use of last_invchan in chan.c:1779, I think the definition of last_invchan needs to be NICKLEN+CHANNELLEN+1, can you confirm/change?

[michaelortmann]

Not specifically addressed in this PR but maybe missed when this was implemented- based on the use of last_invchan in chan.c:1779, I think the definition of last_invchan needs to be NICKLEN+CHANNELLEN+1, can you confirm/change?

CHANNELLEN+1 as it is, is correct. parameter msg in this function is really only <#channelname>

[23:55:37] [@] :michael!michael@Clk-8553FB0D INVITE BotA :#test