relax SVN archive

Created a simple saved program state file for the state.load() unit tests.

Modified open_read_file() and open_write_file() to handle file descriptors, by returning the arg.

Changed the 'file' arg to 'state' in the functions of the generic_fns.state module.

More fixes for the state.load() and state.save() arg unit tests.

Modified the base class unit tests of state.load() and state.save() to use the arg 'state'.

Modified the arg unit tests of state.load() and state.save() to use 'state' rather than 'file'.

Modified both state.load() and state.save() to accept file descriptor objects.

Created the RelaxStrFileError.

This is for when an argument can either be a string or file descriptor.

Modified the state.load() and state.save() unit tests to use a tmp file descriptor.

Currently these functions only allow a string file name and don't handle file descriptors, but this
will be changed.

Added the framework for the unit tests of the generic_fns.sequence module.