[BioPython] PDB header parser

[Thomas Hamelryck]

Hi everybody,

Thanks to Kristian Rother (again!), Bio.PDB (the Biopython module that deals 
with macromolecular structure data) now also provides convenient access to a 
PDB file's header information.

The Structure class now has a 'header' attribute which is a dictionary whose
keys are the header fields.

For example

>>> structure.header["structure_method"]
x-ray diffraction
>>> structure.header["resolution"]
2.2

The code is in the CVS repository.

Best regards,

---
Thomas Hamelryck
Bioinformatik centret      
Universitetsparken 15     
Bygning 10                 
DK-2100 København Ø
Denmark
http://www.binf.ku.dk/users/thamelry/