Added all files to one ACHP module to be SWIGGED
Removed old files
Started testing of calcs for maximum heat transfer rate in BPHE

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Fixed complementary enthalpy calculation & added check for the energy balance in each cell of BPHE

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