relax SVN archive

Started to redesign to simplify the argument RelaxError classes.

The argument RelaxError classes have been put into relative order compared to the previous chaos.

The RelaxNone* classes are now directly under the equivalent non-None class, and the simple types,
lists, tuples, and mixed classes separated into subcategories.

Removed a number of now unused RelaxError imports.

All the non user function classes have now been migrated to use the new 'check' and 'base_class' modules.

Fixes for the eliminate arg unit tests.

Added the is_tuple() function.

Created the Basic_class for simplifying all non-user function classes.

All the user function classes have now been migrated to use the new 'check' and 'base_class' modules.

Added the is_func() function.

Created the RelaxNoneFunctionError error class.