relax SVN archive

Created the Relax_fit.test_bug_18789() system test for catching bug #18789.

The Grace file is written out, re-opened, and then the numbers checked.

Added the script for triggering bug #18789.

This script comes from the bug report submitted by Elio Cino <ecino att uwo dott ca> at
https://gna.org/bugs/?18789.

Added some peak list files in preparation for a system test to catch bug #18789.

This data comes from the bug report submitted by Elio Cino <ecino att uwo dott ca> at
https://gna.org/bugs/?18789.

Fix for the _minimise_data_setup method introduced at r14780.

The spin_id string needs to be stored in the data_store structure.

Fix for the GuiTestResult class with the restoration of IO redirection.

The RelaxTestResult.stopTest() method is now actually called instead of the
TextTestResult.stopTest() method.

The GUI test result classes are now being used by the GUI test suite code path.

Implemented some new classes to allow better control of the test suite from the GUI.

The GuiTestResult and GuiTestRunner classes have been added to the relax_test_runner module, and
these are used rather than RelaxTestResult and RelaxTestRunner if the from_gui flag is sent to the
main Test_suite_runner class.

The unittest _TextTestResult object is now depreciated!

All instances of _TextTestResult have been replaced by TextTestResult.

The test result handling is now performed 100% in test_suite_runner.

Previously each class of test (system, unit, and GUI) were managing a separate instance of
RelaxTestRunner. Now it is all controlled from one spot. This will allow better management of the
tests from the GUI.

The results of the unit tests are now going to the proper sys.stdout stream.

The text was previously sent to the initial stream that sys.stderr is set to. This is overwritten
by relax though to be able to send it to the relax controller. This allows the results to be
captured.