Updated Hyena version to current Hyena master.
Fixed GroupSelector.SetLimitsToDates parameters ambiguity.

- Changed parameters types from `DateTime` to `System.DateTime`
  to avoid ambiguity with `GLib.DateTime`.
Fix GroupSelector.Box.Bar default value.

- Fixed GroupSelector.Box constructor so GroupSelector.Box.Bar will
  always have a value.
Fixed FSpot.App constructor base call parameter.

- Changed `GLib.ApplicationFlags.FlagsNone` by
  `GLib.ApplicationFlags.None`.
FSpot.Widgets.Curve.OnDrawn commented to try to compile.
Updated autogen.sh `hack to get around xamarin bug#4030` to GTK3.
ImageView.OnSetScrollAdjustments restored to avoid crash at start-up.
Uncomments commented Gtk.Box.PackStart to recover some UI fragments.

- Uncomments commented code because lacking of Gtk.Box.PackStart
  with default parameters —I've simply used default values.
Merge pull request #12 from Sanva/gtk3

Changes to be able to compile F-Spot