MAKE: backwards compat for old libtool
Implemented clear functionality for DCC download manager. Created clear button in DCC downloaded manager interface.
Fixed coding style and clearified some comments, following arnavion suggestions
Removed restriction that disabled the clear button if at least one transfer item was selected in dcc download manager.
Move optimization settings from all subsequent projects to hexchat.props
Upd: Properly handle http errors

Also some cleanup of some old code and comments
Merge pull request #679 from hasufell/libtool

MAKE: backwards compat for old libtool
Use system's libsexy by default

It will still fallback to static
Python: Fix callbacks for the "special" print hooks
Fix some warnings
Tweak cli output and fix related warnings
Have join dialog suggest #hexchat for freenode users
Remove #hexchat from default autojoin
Merge pull request #687 from Mikah89/clear_dcc_list_rebased

Clear button in dcc download manager