relax SVN archive

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.

Fix for the prompt/script UI modes for the user function arg check of an int list.

The wrong function in the arg_check module was being used.

Converted the temperature user function to the auto-generation design.

Fix for the structure.read_pdb and read_xyz user functions - set_mol_name should be strings!