fix crash
Add valleynode to network list

Closes #631
configure.ac: Use pkg-config's CFLAGS for libxml2 instead of guessing our own.
be more specific about sysinfo menu entry
Python: Save pluginprefs to seperate files
Python: return true/false from set/del_pluginpref
Add IRCNode to the server list.
Remove IPv6 check for IRCNode entry in server list.
Merge pull request #633 from FionnK/master

Add IRCNode to network list
Rename favorite channels to autojoin channels
translate servlist tabs
treat banlist event as a generic list event (for quiets etc)
fix loading startup.txt automatically
Python: revert 43bd9483ce

Will possibly come back to this at a later time...
Improve error message from /load -e
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Retrieve reachable addresses only.

AI_ADDRCONFIG helps not to try to connect unreachable ipv6 address if
user doesn't have ipv6 network stack.
Merge pull request #634 from youknowone/ipv6

Retrieve reachable addresses only.
Add copy option to right click in banlist

Closes #626
Add missing gtk_tree_path_free()