Strip trailing space from CAP REQ

Mentioned in #770
Fix url detection of channel with nick prefix

Closes #769
Only underline the channel part if nick prefix
Fix /cycle command

- Uses the correct channelkey when called from another tab
- Allows it to be used from any tab in the same server
- Verifies it's a channel you are in
Revert menu.c @ ae04663aa9

This caused a few bugs such as improperly setting away/back
and redrawing the channel tree when the menu is opened.
Update help messages for userlist buttons and user popups
typo..
Fix tab completion with utf8 completion char

Closes #738
Split long messages at spaces
Remove hextray
Update installer links to 2013 redist
Make join dialog modal
Don't open most windows at mouse position
Only show users country if its not unknown
Make Python version consistent  on both platforms

and don't hardcode 2.7/3.3
Remove whats left of gconf
Update appdata description
typo
Remove remnants of native file dialogs
Tweak svg file