PAL v0.9.8: Add palRanorm

Release v0.9.8

- Add palRanorm
- Minor compilation fix on Windows.

PAL: Version 0.9.7

• Enable light deflection in palAmpqk.

PAL v0.9.5

• Add light deflection to palAmpqk. SLALIB always had it but for some reason
  the relevant piece of code never got ported to PAL.

PAL v0.9.4

• Add light deflection to palMapqkz (thanks to Scott Daniel)
• Add test for palMapqk (thanks to Scott Daniel)
• Correctly disable documentation build when running outside of a Starlink
  environment.

PAL Version 0.9.1

• Minor documentation cleanups

V0.9.0

• Add palPcd and palUnpcd
• Update latex style for SUN/267

v0.8.0

Add palEcleq

PAL v0.6.0

Add palVers function to obtain PAL version information.

Minor build cleanups

The configure script was getting confused if run outside of
Starlink without using --without-starlink. This was because
$STARLINK is set in the script if it is not set and the
configure script was assuming $STARLINK would be unset
outside of a Starlink environment. The configure script
now keys off $STARLINK_DIR but that may interact badly
if STARLINK_DIR is set and --without-starlink is used.

An experimental SConstruct build script is now available
for users of scons.

SUN/267 has been synced up with the associated source files.

palIntin now respects the isblank configure check (as it
should have done all along).

Minor clean ups of some source prologues.

Version 0.5.0 of PAL

Now works with ERFA https://github.com/liberfa/erfa. The configure script has been modified to first check for ERFA and then check for SOFA.