* src/plugins/stock_link.png: added icon for scratchpad display
* src/DdTargets.py (all_text): new method to return all text ddtypes
* src/TreeTips.py (__treetip_show): added support for tips to be callable
methods so that tips can be generated on the fly.
* src/plugins/Makefile.am: added stock_link.png icon
* src/plugins/ScratchPad.py: almost complete rewrite to make proper use
of gtk widgets and make more flexible for adding support for new
dnd object types. Added link icon if the object is a link to a primary
object.
svn: r4262
