[#PRX-254  OutOfMemory Exception Due to Improper loading of pixel data into memory ]

finished out of memory exception and currently
Currently no pixel data is loaded, coercion is still on receive and
forward.
Used dcm4che lib BulkDataURI reference in the attributes instead
Now the proxy creates a tmpBulkData file for the reference which is
deleted afterwards
Some changes had to be made to how files are deleted to fix one issue
with deletion on windows (part files are deleted by a scheduler on
windows) and should not effect performance (tested on windows machine)