Version 0.2.2 is available!

News since last version are:
- added new charset plugin, which replaces internal /charset command: fixes many bugs with charsets, WeeChat internal is now full UTF-8
- added "modifier" in plugins API: plugins are now able to modify or drop received IRC messages
- added filename completion
- added anti-flood mechanism
- added keys to scroll topic
- added new option to send unknown IRC commands
- improved /plugin command
- pdf version of documentation is back
- fixed many bugs: portability, memleak in keyboard input, ignore and alias commands, many display bugs.