Fixed Propane ancillary for rhoV

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Added uppercase strings and fluid name for R1233zdE for compatibility with EES.

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Mixtures can use beta = 0 or beta = 1 for phase envelope, although beta = 0 is the only one that seems to work

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge branch 'master' of https://github.com/ibell/coolprop