also added ability to use Compositions as a std::hash in unordered_* types. Further added a constructor to build a Composition from a const CompositionAbstract&
MaskedComposition is a generally useful decorator, therefore instead of forcing callers to impliment it on their own, we have implimented it as part of libcomposition
Composition objects now must be built from vectors of molar abundances. Things such as mass fraction and number fraction are computed on the fly (with some caching for performance). This will allow for many fewer issues when converting from solver space to composition space.
BREAKING CHANGE: The entire old API has been broken. There is no longer any need to finalize. In fact the entire concept of finalization has been removed. Further, the entire CompositionEntry and GlobalComposition data structure has been removed. Any code written for the old version will no longer work and major reworking will be needed to use the new version.
This is a very basic wrapper implimentation currently. This is sufficient to lock the interface down so that other code can target it. However, internally there is just a "convert" function. Eventually we should rework the code itself to use the composition module more directly.
