relax SVN archive

Reordered the relax debugging save state so that the format is yyyymmdd_hhmmss rather than yyyyddmm_hhmmss.

Bug fix for the compile_2nd_matrix_iso_cone() function.

The T23 and not T14 transpose should be performed!

Made the integer printout 4 char wide.

Fix for the print_frame_order_2nd_degree().

The NaN fix was partly incorrect.

Fixes for print_frame_order_2nd_degree() for when NaN is encountered.

Renamed the state.load() and state.save() directory argument from dir_name to dir.

This is to bring it in line with the rest of relax.

Added a dir arg to a state.save() call in test_state_pickle().

Changed the default save state to XML.

Fixes for load_pickle().

The ds.__reset__() call has been removed because of redundancy and the new ds.is_empty() has been
blacklisted.

Duplicated the test_state() system test into test_state_pickle() and test_state_xml().

This tests both formats.