Rename 'paircopy2' to 'paircopy_by_num'
make radius_tmply_copy_vp respect instance numbers and NUM_ALL (*)
radius_parse_attr writes nice descriptive errors to the error buffer, so use them...
Allow Attr[*] in radius_parse_attr
Make it clearer how the switch-attr-cmp test failed
Refactor radius_map2vp and add support for returning multiple attributes from RHS attr references