relax SVN archive

Added a module for the creation and parsing of XML documents representing a data pipe.

The write() function now catches and translates the special dir name 'pipe_name'.

Changed the default values of the args of the results.write() user function.

The dir arg now defaults to the special value of 'pipe_name' and the format arg defaults to 'xml'.

Changed the args to the results.read() user function.

The dir keyword now defaults to None and the format arg no longer exists, as it is assumed that
relax will autodetect the file format.

Removal of the molecule and residue selection flags.

Only the spin selection flags are used.

Bug fix for the __set_xh_vect() method.

The attached_proton value of None is now really None and not the string 'None'.

Bug fix. The global noe_r1_table list is now updated correctly.

Fix for the test_read_results_1_2() system test.

Renamed all instances if 'hybrid_runs' to 'hybrid_pipes'.

Small code rearrangements in the relax 1.2 model-free results file reading system test.