UTF-8 Friendly Release

• Modernized the autoconf/configure system.
• A bunch of minor bugfixes to get a clean compile with "gcc -Wall" and "clang -Wall".
• cbufs get zeroed out before reuse - security patch.
• Cleaned up and modernized the perl db-manipulation scripts.
• Added a UTF-8 parser and changed the way filtertext works and is used to allow for UTF-8 messages. User nicks and group names are still limited to a restricted 7-bit ascii character set though.