Docupdate

Docupdate branch creates a starlink.cls for latex docs and uses tex4ht for html output of new-style docs.

This branch should (hopefully) work seamlessly provided people:

a) have tex4ht installed on their system (through e.g. a recent texlive install) and

b) set up the environmental variables STARLATEXSUPPORT and TEXINPUTS to point towards the:
 <starlink code checkout>/applications/latexsupport 
directory before building the software.

e.g.
export STARLATEXSUPPORT= ~/starlink/applications/latexsupport
export TEXINPUTS=~/starlink/applications/latexsupport//:

Currently, the documents SC21, SUN258 and SUN95 have already been updated to use the new system.