relax SVN archive

Removed all unused imports from the pipe_control package.

Removal of unused imports from the GUI test modules.

Added a workaround or hack for exceptions for circular imports in the find_unused_imports.py script.

This is currently for the test_suite.unit_tests._lib.test___init__ and
test_suite.unit_tests._lib._geometry.test___init__ modules.

Added another exception to the find_unused_imports.py devel script.

This is for the test_suite.unit_tests._lib._geometry.test_rotations module which programatically
obtains the imports using globals().

Removed unused imports from the unit tests.

Changed the import of pipe_control.state in the test_state unit test module.

Changed how the import of lib.regex in the Test_regex unit tests is used.

The module is no longer stored in the TestCase class namespace, but is rather called directly within
the unit test.

Removed unused imports from the Structure system test base module.

Clean up of all unused imports in the system test scripts.

Removed unused imports from the Relax_disp system test base module.