Changes as follows:
 - QC checks now done whenever the "Run" button is pressed
   at either the GapFillUsingAlternate GUI or the
   GapFillUsingSOLO GUI, this allows a degree of interactivity
   when removing data identified as bad during the gap
   fill process
 - ratinalised some QC flags
   - QCflags for basic checks now the same value at all levels
 - reinstated James' CorrectSws function and
   CorrectIndividualFgForStorage
 - removed UstarFromFh and associated code