relax SVN archive

Fix for the test_write_protein_sequence() unit test for a recently introduced bug.

Python 2.4 and lower fix for the pipe_loop() generator method.

In these Python versions, a 'try' block with a 'finally' statement cannot contain 'yield'
statements! This work around should be compatible with all Python versions.

Python 2.4 fixes - the ctypes module does not exist in Python versions 2.4 and lower.

This is only used for some non-essential functionality on MS Windows, so now it is deactivated if
not present.

Created a special script for testing out relax with Python versions 1.0 all the way to 3.3.

This builds the C modules for each Python version in ~/bin and then runs the test suite, outputting
everything to log files.

The Results system tests are no longer dependent on the relaxation curve-fitting C modules.

This allows these tests to run when the module cannot be imported.

Python 2.5 and lower fix for the test_write_protein_sequence() unit test.

The byte array is wrapped in an eval() statement to allow Python 2.5 and lower to parse the code
without failing, and the byte array comparison is now only used for Python 3+.

All system and GUI tests reliant on the relax-fit C modules are deactivated if import fails.

This removes a pile of useless error messages from the test, and presents a table of skipped tests
at the end.

More Python 3 fixes for the use of now non-existent string module functions.

Python 3 fix for the model-free BMRB export - many string module methods no longer exist.

Removal of the tensor_data branch as this is now merged into trunk.