S-Lang XPA and DS9 module updated

Version 0.4.3 of the S-Lang XPA and DS9 module is now available at

	http://space.mit.edu/cxc/software/slang/modules/xpa/

The driver for this release was to address two serious issues:

   - When DS9 bins images from event lists the FITS header it returns
     for the image does not reflect BITPIX=-32, but rather BITPIX=8
     from the original event list.  This could cause image pixel arrays
     retrieved by ds9_get_array() to have the wrong S-Lang datatype
     (making them essentially corrupt/unusable);  we now check if DS9
     has binned the image itself, and if so reset BITPIX accordingly.

   - MAC OS/X testing revealed that char arrays returned by the S-Lang
     XPAGet() wrapper were not always properly NULL-terminated.

The regression tests were updated to interoperate with a wider number
of DS9 versions, and several minor new functions were added.  Please
see the CHANGELOG for more details.

Best,
-- Mike
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