Bug#1007103: Further information

[Ted Felix]

  I just pushed improved plugin logging as [3a07309c].  If you can, 
please test latest git:

  https://sourceforge.net/p/rosegarden/git/ci/master/tree/
  A debug build should now let you know when it is trying to load a 
plugin.  And that should be the last thing you see from rosegarden when 
a plugin crashes on load.