Closes jowr#15 and completes the work for 64bit on Linux and MacOS, I…

… hope.

Added MacOS support. Hopefully this is the last 32bit only release.

Fixed some Linux build issues, still Refprop 9.1 only

Tested on OSX 10.8 and Linux, tailored for Refprop 9.1

Installed and tested for Refprop v9.1

The last version that works with the Refprop 9.0 Fortran sources.