Merge pull request #184 from nilshartmann/master

Fixed NullPointerException on first access XRef View
[BM-357] Remove 'org.bundlemaker.core.ui.print'
[BM-341] Unify Plug-in name (bundle names) of bundlemaker bundles
[BM-356] Don't open the source viewer if no source is available
[BM-183] Add an 'Clean parse' action
~ clean-up
~ clean-up pop-up menu
Merge pull request #185 from nilshartmann/master

BM-349 First implementation
added transformation history plug-in to launch config
Initial select only artifact that is selected in the project explorer
(if any) inside the center view. Do not select something in 'from' and
'to' viewers
Clear selection in 'to' and 'from' viewer when selecting a new artifact
in the center