relax SVN archive

Fix for two of the arg_check.is_*() fns - the individual elements were incorrectly checked.

Created RelaxValListValError and RelaxNoneValListValError for the arg_check.is_val_or_list() fn.

The prompt UI can now handle the user function arg type of 'val_or_list'.

Eliminated the try logic in the arg_check is_*() fns as the raise_error flag can now be used instead.

The change at r16136 in the main 1.3 line allows this simplification.

Created the arg_check.is_val_or_list() function for the value.set user function.

The value argument of this user function is now classified as a 'val_or_list' object, hence this
is_val_or_list() replaces the use of is_str_or_num_or_str_num_list().

Clean up of the prompt package __init__ module.

Converted the vmd user functions to the auto-generation design.

Eliminated the view user function as this is ancient dead code.

This user function has essentially remained the same as when it was introduced at r788 back in the
0.3 relax line in October 2003! It has never actually done anything and has somehow managed to
survive in the source tree unnoticed.

Converted the value user functions to the auto-generation design.

The auto-generated GUI user functions can now handle the 'val_list' argument type.

This is needed for the value.set user function whereby the 'value' argument can be almost anything,
either as a single float, int, str, None, etc or as a list.