- resolves issue #181
- Masses can be created from any Tensor, there are even implicits in the MassesVariable object
- Proportions can be created from any Masses object via MassesProportions, (argument is either a Masses object or a Tensor)
- some minor cleaning
renaming
initialize masses massTotal from tensor with current sum
ProportionsWithPrior trait, that is exploited in the Collapser and can be mixed in with any kind of proportion
Some simple renaming
Merge pull request #182 from dirkweissenborn/tensor_updates

Creating Masses from any tensors, and Proportions from any Masses