kaplibs: New function to make an STC-S outline and add to an NDF extension
ast: Add cautionary warning to docs for astFreeDouble

You should not use astFreeDouble if the array of pointers has been
allocated using astGrow, since astGrow over-allocates and so leaves
uninitialised pointers at the end of the memory block.
ast: Split long STC-S properties up into multiple lines

This is to honour the api for the StcsLength attribute
smurf: Add STC-S outlines to all created JSA tiles
kaplibs: Rename kpgOutline as kpgPutOutline

coz we'll be having a kpgGetOutline shortly...
kaplibs: Allow KAPLIBS to read regions from the outline extension of an NDF

KPG1_GTOBJ (used for instance by kappa:ardplot and all the atools
commnds) will now read and return a polygon from the OUTLINE extension of
an NDF, if present. It uses the new kpgGetOutline function to do this. So
for instance

% kappa
% ardplot region=myndf

will plot the STC-S polygon in myndf.sdf (if one exists).
ast: Fix bug writing STC-S regions

The keyword identifying the sub-phrases was being written out once for
each axis, rather than once for each sub-phrase.