relax SVN archive

Clean up and completion of the TODO for the Processor.assert_on_master() method.

The Processor.assert_on_master() method has been created and calls raise_unimplemented(). The
Multi_processor.assert_on_master() method has been shifted to Mpi4py_processor.assert_on_master(),
as that method's error message is MPI specific. The empty Uni_processor.assert_on_master() method
has been added to allow that fabric to work.

Whitespace fix.

Spun out all of the results queue objects into their own module.

This completes another set of TODOs by removing these queue objects from any fabric level. They
can now be imported and used by any fabric level (Processor, Multi_processor, Mpi4py_processor,
Uni_processor, etc.).

Shifted the run_command_queue() and run_queue() methods from the Multi_processor to Processor class.

The multi/test_implementation2.py script can now be run in uni-processor mode.

Thought it still fails due to deficiencies in the Processor base class (one of Gary's TODOS in the
Multi_processor class).

Comment fixes.

The multi/test_implementation2.py script now properly uses pre-send data in the slave calculations.

The sending component is complete (though is still non-functional on the uni-processor). However
the handling of data post-calculation still needs to be abstracted via the API.

Partially implemented the Processor.data_update() method.

This now should work when the rank argument is not supplied.

Removed the Test_slave_command_presend class as the multi-processor API is now simpler.

The single line data_update() API function call is now used instead.

Created the special command object Slave_storage_command for transferring data to slaves.

This command currently has two special methods:
- add(), used by the master processor to add data to the command for transfer.
- clear(), used by the slave (via run()) or the master to clear out all data.