relax SVN archive

Fix for the system test Unit_vectors.__init__() method - the wrong base class __init__() was being called.

Missing import.

The unit vector system tests using scientific python are now being skipped if the module is not installed.

The test suite summary is not longer printed for each category when all tests are run.

The structure system tests involving scientific python are now skipped if the module is not installed.

Changed the text of the missing module test suite table print out.

Only print out the part of the optional module table when those tests are run.

Alphabetical ordering of functions, and comment updates.

Removed the top spacing from the subtitle() function.

Fix for the subtitle() function, the width was too small.