Converted the ScientificPython PDB reader to support both Python 2 and 3.
The command used was: 2to3 extern/scientific_python/IO/PDB.py -w
The __repr__() method was manually modified due to the 'list' variable clashing with the 'list' type.
Authored by: bugman 2012-10-02
Parent: [r17647]
Child: [r17649]
