relax SVN archive

Changed all instances of 'run.create' to 'pipe.create' as in the new design.

Corrected the location of the get_string() function.

This was noted by Edward d'Auvergne in a post at:
https://mail.gna.org/public/relax-devel/2008-04/msg00034.html (# Message-id:
<7f080ed10804040747q36313c26mcc60989634028b56@...>)

Added the load_structures() prototype method stub.

Reverted changes of the variable 'nucleus' to 'heteronucleus'.

The command used was:
svn merge -r5308:5302 ./physical_constants.py

This error was noticed by Edward d'Auvergne in a post at:
https://mail.gna.org/public/relax-devel/2008-04/msg00033.html (# Message-id:
<7f080ed10804040741x3e26f862r808982451ab522c8@...>)

Added a string used to identify the structural object.

Updated the methods of the Scientific Python PDB specific structural object class.

These now use the structure of the new object.

Partially fixed more of the code so the Jw mapping system test can go further before failure.

Re-introduced the test for the existence of the current pipe and correcte a comment.

Changed the parser specific data object name to 'structural_data' and initialised it to [].

Partially fixed the code so the Jw mapping system test can go further before failure.