Added keyboard shortcut for 'Copy Label from Active to Selected' - (Shift-V)

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4537 96b784f8-4ae3-dd11-aff7-0030488c597c
Changed poll def in 'LinkToOutputNode'. Previous def returned error in some cases.

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4538 96b784f8-4ae3-dd11-aff7-0030488c597c
Bug fix. Simple syntax error. Sorry

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4539 96b784f8-4ae3-dd11-aff7-0030488c597c