Implemented access to mixture binary pairs in get_global_param_string

See https://github.com/CoolProp/CoolProp/issues/152

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Updated python docs for doxylink purposes

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

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Changed path for doxylink (works to a point now)

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Removed old files from codelite project

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