Clicking in a blank zone of the treeview now deselects eveerything
Fixed bug where the graph was updated on a single click
Put the treeview in a scrolled pane.

Without it, the window had for its minimal height, the height of headerbar+columns height+(n_of_torrents * row height) + bottom panel.
settings.glade is now copied in the build dir
Fixed lag when selecting another torrent
Toggle the start/pause buttons

Depending on the selection, the buttons may or may not be visible.
Better icons (on my theme at least)
Size and order of columns are now saved

I just realized that the resize mode is really weird, also it's not complete yet, I need to make it remember the hidden column.
Hidden columns are now memorized
Fixed bug where block graph wouldn't update
Fixes crash when saving the settings
Merge pull request #74 from gtorrent/wip/ui-fixes

A few UI fixes/enhancements.