relax SVN archive

Unit test fixes for the shift of relax_data from specific_fns to generic_fns.

Shifted the test_relax_data unit test module from _specific_fns to _generic_fns.

Fixes for the read(), data_init(), and data_name() (now get_data_name()) functions.

Updated the relax_data.back_calc() user function to the new design.

Wrote the arg unit tests of the relax_data.back_calc() user function.

Fixed the relax_data imports again.

Converted all class methods into module functions.

Fixed some imports of relax_data.

Shifted the relax_data module from specific_fns to generic_fns.

Initialized merge tracking via "svnmerge" with revisions "1-6332" from
svn+ssh://bugman@.../svn/relax/1.3