ConvertHSA:

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   Convert HSA times to dihedral angles and chordwidths, or convert HSA data
   from the type provided to the desired processing type.
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   Form:
   [varargout] = ConvertHSA( action, varargin )
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   ------
   Inputs - Not all inputs are used for all actions: see formats in case statements
   ------
   action               'TimeToAngles' or 'AnglesToTime' or
                        'Processing' 
   dAngle   {2}         dihedral angles (rads)
   cWidth   {2}         chordwidths (rads)
   tLE      {2}         leading edge times (sec past CEP)
   tTE      {2}         trailing edge times (sec past CEP)
   jDCEP   (n,1)        Julian date of CEP time for each period
   hSAData  struct      Contains data and processing types for HSA measurements
   spinRate             Spin rate (rad/sec)

   -------
   Outputs
   -------
   dAngle1              Dihedral angles from HSA 1 
   dAngle2              Dihedral angles from HSA 2 
   cWidth1              Chordwidths from HSA 1 
   cWidth2              Chordwidths from HSA 2
   hSAData              Same as input, but updated if converted times to angles

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