plugins exception

Plugins exception are displayed in a rather ugly manners right now.
Maybe show the traceback in the information buffer or save it to the error.log and just display a generic error report pointing the user to the file?

Attached is an example with the gnupg plugin failing on loading.

• Changesets:
  • Revision dc5e3b33 by mathieui on 2014-07-09T14:00:22Z:

Fix #2546 (ugly tb with the gpg plugin)

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