This attribute controls the issuing of warnings about selected
conditions when an ObjectObject or keyword is read from or written to a
FitsChanFitsChan. The value supplied for the Warnings attribute should
consist of a space separated list of condition names (see the
AllWarningsAllWarnings attribute for a list of the currently defined names).
Each name indicates a condition which should be reported. The default
value for Warnings is the string "Tnx Zpx BadCel BadMat BadPV BadCTYPE".
The text of any warning will be stored within the FitsChan in the
form of one or more new header cards with keyword ASTWARN. If
required, applications can check the FitsChan for ASTWARN cards
(using astFindFitsastFindFits) after the call to astReadastRead or astWriteastWrite has been
performed, and report the text of any such cards to the user. ASTWARN
cards will be propagated to any output header unless they are
deleted from the FitsChan using astDelFitsastDelFits.