rxx: more complex regtests
rxx: More xemacs-related changes.   Added a way to pass regexps as args.  Added in-namespace.
rxx: Copied regex-opt implementation from GNU Emacs for xemacs compatibility.
rxx: rxx-parse now forces a search for a parse of the full string, when asked;
  the implementation for xemacs is incomplete due to limitations of xemacs regexp impl.
elu: Removed dependence on rx.
rxx: word-from-list now can take list of any objects, eg symbols
elu-valu: now use word-from-list
rxx: regtesting -- added test of byte-compilation under GNU emacs
rxx: First cut at validating matches with an arbitrary elisp predicate
checking in current status