relax SVN archive

Fixed the testing of the file arg in the relax_data.write() user function interface.

Added a missing RelaxError import.

Wrote 9 arg unit tests for the remainder of the relax_data user functions.

Converted all of the relax_data user function interfaces to the new design.

Wrote 4 arg unit tests for the relax_data.copy() user function.

Updated the relax_data.copy() user function interface to the new design.

Updated a copyright notice.

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.