Merge pull request #61 from Galithil/fix_entities

cleanup of the Process class
Merge pull request #62 from Galithil/fix_entities

added Unfound node handling for EntityDescriptors
Johannes exelent optimization
Merge pull request #63 from mayabrandi/develop_samples_class

Johannes exelent optimization
fixed a log
Merge remote-tracking branch 'upstream/master' into make_history_class
getting up to date