Improved the XML-to-doxygen script (for producing documentation from test case definitions) and the XML-to-expect script (for producing runnable tests from test case definitions) so that test cases with many units can be written in a shorter form.  Also made minor CSS changes for the built-in test case docs, to bring back the borders for the tables of expected output.
Merge branch 'master' of https://github.com/NAVADMC/SpreadModel