relax SVN archive

Simplified all the argument RelaxError classes using BaseArgError.

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.