relax SVN archive

Completed the test_read_xplor_rna() system test.

Checks for the restraint list have now been added.

Renamed all the noe.read_constraints() references in the unit tests to noe.read_restraints().

The RNA sequence of the noe_rna_hbond.dat file is now generated through a new class method.

Renamed 'constraints' to 'restraints' for the NOEs.

Added the system test framework for NOE restraint reading tests.

This includes one test for the reading of RNA H-bond restraints from an Xplor formatted input file.

Added an RNA H-bond Xplor restraint file.

This comes from http://bass.chem.yale.edu/labdocs/packages/xplor.html.

Added a directory to the test-suite for holding NOE restraint data.

Wrote a stub function generic_fns.noesy.read_constraints().

Created an empty module for NOESY data.

The noe.read_constraints() user function now calls generic_fns.noesy.read_constraints().

The noe user functions need not all point to the specific NOE object! Maybe later the steady-state
NOE can be separated from the NOESY, but for now it isn't too illogical for both to be in the same
user function class.