Pack graphs into pane to make them resizeable (Gtk2)
Port the infobar to Gtk3
Add proper color-setting for the labels in Gtk3
Always show the status bar in the pane

Signed-off-by: Simon Steinbeiss <simon.steinbeiss@elfenbeinturm.at>
Set the initial size of the pane
Prevent drawing the graph if it is too small (Gtk2)
Pack everything in a resizeable pane in Gtk3 too
Always check if the graph is too small to draw it
Drop height-requests for graphs to make them resizable
Merge branch 'pane'
Merge branch 'gtk3_infobar'