New, improved versions of modules:
'ElectreTriCClassAssign' (now 'ElectreTri-CClassAssignments')
'ElectreTriCSimplifiedClassAssign' (now 'ElectreTri-rCClassAssignments')
The main difference here is that instead of internally applied cut
threshold, they require credibility matrix *and* outranking matrix
produced by 'cutRelationCrisp' module.

Some further improvements in 'common.py' re: getting input data.

Fixed some typos, added minor fixes etc.