Removed temporary debug code from milestone2rst.py script

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Use the git checkout to do full clean rather than command line tools - now fully cross-platform

See https://github.com/CoolProp/CoolProp/issues/283

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Python setup script shows call to cmake build

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>