Update from the Adpatagrams repository.
Miscellaneous code cleanup.
Code cleanup for constraint Relationship class.
Fixes for Windows builds.
Draw page and canvas background colour in canvas overview.

Draws the canvas overview to better reflect the canvas by showing the
same background colour and the page outline where one is set for the
canvas.  Plus, the canvas now has an option allowing the user to set
a specific canvas background colour.
Update from the Adpatagrams repository.
Fix a crash when quitting with an unsaved document.
Add missing libavoid header.
Update Garuda plugin to work with Jan13 core version.
Update libsbml macports definition to 5.7.0+layout.
Make sure resources folder exists before copy Garuda files.
Fix bugs with dragging of connector checkpoint handles.
Update with changes from the Adaptagrams repository.
Code cleanup.
Allow opening of Dunnart v1 files from Pro-origami.
Fix a bug with connectors jumping during rerouting.

Dragging a connector endpoint handle could cause the entire connector to
be moved before rerouting, leading to a flickering efffect.
Improve the code for loading Dunnart v1 files.
Differentiate between clusters and nodes in overview.
Fixes to get polyline rubber-band routing working.
Updates from Adaptagrams respoitory.