Allow ValueNode_BoneLink link several types of values
Allow to link to bone vertices, angles, widthpoints, segments, matrices
Allow to link to bone several objects at once
Fix Gtk compatibility issue for State Normal
Add file valuetransformation.h
Improve matrix
Improve ducks (allow to link to origin, angle, scale and skew)
Improve group transformation ducks
Lock aspect for scale. Fix bugs with negative scale.
Fix loading previous versions of Layer_PasteCanvas
Improve Layer_PasteCanvas loading (dont generate unneeded links)
Merge branch 'master' into morevna

* master:
  Portability fixes for OpenBSD. Patch by Aaron Suen.
  Fix description of png_spritesheet target. Cleanup.
  Added target png_spritesheet
  Show icon only for panel toolbar on all platforms
  Add a new screenshot of 0.64.0 for using in Appdata.xml
  Add two new icons
  Set the border relief style of close button of canvas window tab to None
  Make the intltool take care of appdata file