relax SVN archive

Created the write_header() function.

The element name rather than atom name is being passed into the return_atomic_mass() function now.

Variable name fixes for the load_spins() function.

Fixed the atom_loop() call in centre_of_mass().

Fixed the atom_loop() call in load_spins().

Added the 'atom_id' arg to the structural API atom_loop() generator method stub.

The Scientific atom_loop() structural API method now properly returns the element name.

'_flag' has been added to all of the Scientific Python atom_loop() API method flags.

Added '_flag' to the end of all the flag args in the atom_loop() structural API method.

This will avoid many bugs with the flags being overwritten by other variables.

Updated the Scientific Python structural API atom_loop() method.

All the flags are now accepted, and the appropriate tuple is now built.