do...while fix(ph calibration)

Change log:
--------------
Deleted SetupCalibratePH()
Deleted SetupCalibratePHExp()
Deleted SetupCalibrateChoicePH()
Added StartSetupCalibrateChoicePH()
Added DisplaySetupCalibrateChoicePHExp()
Added StartSetupCalibrateChoicePH()
Added DisplaySetupCalibrateChoicePHExp()

* Variables and constants declared as private member of ReefAngelClass.
** PH expansion module untested!

Have a good day!