heterodyne: Flip initialisation of the rejected flag.
SCUBA2: use a copy of the group file in the coadd list

When coadding in running mode, the current group file is included in
the list of files to coadd. This can mean that the file ends up in the
intermediates array where it may be deleted by mistake. This may be
prevented by making a copy of the group file before coadding.
docs: remove corrupt tar file.
docs: update list of modules in SUN233.
docs: remove generated files from repository.
docs: missing back command in ORAC::Group::SCUBA2.
docs: add Makefile to build documentation.

There are 3 main rules: clean, build and install.  Since the
LaTeX files derived from code do not (yet) have dependencies
specified, running 'make clean' is recommended before building.

The Makefile performs the steps from a shell script used
for the Kapuahi release, which are described on the StarlinkRelease
wiki page, with the addition of .htx.build files to track
the building of the HTML documentation.