atl: Guard against 'status set without error' errors
smurf: Fix bug getting NDF fits headers in python

Need to remove new-lines, etc, from value returned by fitsmod.
smurf: Not all HPX JSA tiles have the same WCS

Tiles in the borttm-left/top-right facet use different reference point to
the others, so will have a different WCS. So we need to determine the
mapping separately for every tile, rather than just re-using the mapping
form the first tile.
smurf: More diagnostic info when dicing maps into jsa tiles
smurf: enum conversion functions should not have a status argument

So that they can be used easily even if status is set to an error (i.e.
when constructing the text of error messages, etc).
smurf: More robust handling of JSA tiles that cross RA=12h