Refactor installer: differentiate software version
Refactor installer: differentiate software version

For clarity,the minimum_version bash variable, which holds the
version number for the package that will potentially be installed
no longer has the same name as the wrapped package in the case
of mpich wrapping gfortran.

sourceryinstitute/opencoarrays,sourceryinstitute/opencoarrays,sourceryinstitute/opencoarrays