update for rawdatadir

These files use rawdatadir.
Use aas_find_vol to access any rawdatadir! See examples in the files.

N.B.:
1.
aas_convertdmdx and aas_convertseries seems to be remnants and still
contains some errors: e.g. "dicomdatadir" is not defined

2.
aamod_epifromnifti exepcts aap.acq_details.subjects(subj).seriesnumbers
to be a list of filenames in cell array instead of series numbers,
however, aas_addsubject provides only numbers.