Pull calculated doses out of exported dicom files

This function requires files from the MPPG repository for reading and
parsing the dicom data. The registration/dicom offset information is
important.
Accumulate OSLD data from multiple trials

The data must be in a specific folder structure for this to work. Notes
are in the comments.
Removed the manual calc dose stuff

Replaced it with the function to read out calc dose from dicom files.