ast:FITS comment cards cannot be converted to any other data type

Previously, attempting to convert comment cards to other data types
produced undefined results due to the contents of supplied buffers being
left uncahnged. But a misplaced equals sign in a header card causes the
card to become a comment card. So previously, such cards resulted
spurious WCS values. Now, they result in warnings.
ast: Add F77 interfaces for astGetWcsWrap and astSetWcsWrap
smurf: Guard against seg fault if an error occurs
smurf: Add JSA pixel coord Frame to all-sky JSA map made by jsatileinfo
smurf: Only switch off wcs wrapping for tiles that straddle RA=12h