Fix use of magic numbers in GtkGraph.
For those tempted to do it again, read the haiku in draw() and don't do that shit.
back to 60 seconds graph
history can now extend what is shown
add basic right click menu
for some reason i had to derive from Gtk::Button to get a click signal,
    this is weird
add time divisions
change add to addValue to not shadow virtual function
graph menu is now based on arbitrary string holding intervals
add GraphIntervals option
add GtaphPreferredInterval option
Merge pull request #97 from gtorrent/wip/timed-graph

Timed Graph