[#PRX-246 #PRX-248 #PRX-247  fix Merge Storage commitment with and or logic ]

Fixed Nullpointer exception during merge,
cache files for nevent are always deleted
empty directories are always deleted now
[#PRXREQ-75 Improvements to match the transfer capabilities for the desired C-Store destination systems ]

Added minimal transfer capabilities to be loaded from AE configuration,
in case of empty configuration, the proxy is then used as a source for
supported transfer capabilities.
TODO autoconfiguration (already created tool to do the required
autoconfig funcionality in the dcm4che3 library under the name probetc)
TODO wizard button for autoconfiguration.