[PATCH] toggle "show change path by default"

This is a follow up mail to my email "Fetch affected paths on demand" to
the users list.

There I asked for a possibility to disable fetching affected paths in
the SVN history view. The rationale behind this feature request is that
fetching affected paths can be an expensive operation, even with "Fetch
affected paths on demand" enabled. Especially when linking the SVN
history view to the editor this can become an issue. Since in subclipse
0.9.32 it can't be disabled, I have implemented it. Please find the
patches to core and ui attached.

The patches adds two things:
* A context menu for the tableChangePathViewer that contains one toggle
menu item "Show affected paths". When it is switched off, affected paths
are no longer fetched, until it is switched on again.

* A preference "Show affected paths by default". This preference
controls the default value of the menu item above.

Of course it would be great if the patches could go into trunk, because
then I wouldn't have to maintain them for new versions of subclipse. ;-)
But even if they can't go in for some reason I would be interested in
feedback.

-- 
Bernd Rinn