removing chunks on file deletion
TEST: removing a chunked file
TEST: move a chunked file from one catalog into a nested catalog
added an SQL wrapper for chunk retrieval
allow shortstring to be created from an std::string
added a convenience constructor to the FileChunk struct in util.h
FIX: wrong name of test case (copy and paste -> no time waste :o) )
can now retrieve all chunks for a certain chunked file
creation of new nested catalogs now supports chunked files