bugfixes in comparer and Aggregate to handle files with no soma roi
Merge branch 'master' of github.com:hillierdani/visexpA

Conflicts:
	users/daniel/configuration.py
bugfixes
Merge branch 'master' of github.com:hillierdani/visexpA

Conflicts:
	engine/datadisplay/comparer.py
	users/daniel/configuration.py