Add sanity checking of incoming nicknames.
Check that at least the first character of an incoming nickname is valid (we actually go a bit beyond the RFC by also allowing any char with bit 8 set - at least Russian servers use nicknames like this). git-svn-id: svn://svn.code.sf.net/p/bitchx/code/trunk@501 13b04d17-f746-0410-82c6-800466cd88b0
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