create_dip.py script changes file names from BagIt transfers

[djjuhasz]

Running the create_dip.py on an AIP created from a transfer of a BagIt bag causes the initial three characters to be removed from all of the file names in the DIP objects directory. The following warning is output when this occurs:

INFO 2021-08-03 15:36:40 Moving file: objects/box4b12.bin
WARNING 2021-08-03 15:36:40 premis:originalName not starting with %transferDirectory%objects/

In the case above, the final file name in the DIP objects directory (zipped) was: 4b12.bin.

[djjuhasz]

Fix merged to "master" branch: e5a9f80