relax SVN archive

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.

Split the multi.commands module into two - the slave commands and result commands.

This rearrangement is only for code clarity.

Removed the Mpi_processor.data_upload() method as this will be done at the Processor level.

Shifted all of the processor command objects into the multi.commands module.

The other multi.api module objects have been shifted into the multi.misc module.

The multi-processor package now allows sys.exit() calls within the master processor.

This affects all processor fabrics, as the Processor.run() method has been modified. The SystemExit
exception is now specifically caught on the master. The Processor.exit() method is then called to
allow the specific fabric to clean up, if needed, and then the SystemExit is re-raised to allow the
system exit to proceed as normal.

Removed a number of sys.exit() calls from different relax modes.

The return call is used rather than sys.exit() to exit the main run() method. These were not needed
and it allows the 'version', 'info', and 'gui' modes to play better with the multi-processor package
when using mpi4py.

Shifted the mpi4py processor module functions broadcast_command() and ditch_all_results() into the class.

These have been turned into private methods.

Redesigned how the multi-processor package terminates program execution.

The Processor.exit() method has been introduced to perform this action. By default (used by the
uni-processor fabric), the method does nothing. The mpi4py_processor.py module functions exit() and
exit_mpi() have been merged into the Mpi4py_processor.exit() method.