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.
EOS code updated to make use of composition module. This is part of the larger change to change all composition handling to use the composition module. Note that the current implimentation is a bit hacky since it simply copies back and forth to the alredy used HELMEOSInput and HELMEOSOutput structs. In furture this can be more tightly connected to avoid extra copies.
Composition can now be placed in either number fraction or mass fraction mode and can (after finalization) convert between them. Subsets of compositions can also be made. Normalization has also been added to finalize. Tests have been added
