astPurgeWCSastPurgeWCS - Delete all cards in the FitsChan describing WCS information

Description:
This function deletes all cards in a FitsChanFitsChan that relate to any of the recognised WCS encodings. On exit, the current card is the first remaining card in the FitsChan.
Synopsis:
void astPurgeWCS( AstFitsChan $*$this )
Parameters:
this
Pointer to the FitsChan.