Code fails when there are session folders in the func folder but not in the anat

[paola-g]

config.session is set in rsDenoise.py dynamically by checking the func folder.

In makeTissueMasks it falls back on config.session, but I should instead check whether there is a session folder in the anat folder, or bypass it completely using a wild card.

[paola-g]

Implemented fix in bob branch (not tested yet)