* lib/gl_avltree_omap.h: New file.
* lib/gl_avltree_omap.c: New file.
* lib/gl_avltree_ordered.h: Code moved to here from
lib/gl_avltree_oset.c. Parameterize.
* lib/gl_avltree_oset.c: Include gl_avltree_ordered.h.
* lib/gl_anytree_omap.h: New file.
* modules/avltree-omap: New file.
* modules/avltree-oset (Files): Add lib/gl_avltree_ordered.h.
(Makefile.am): Add gl_avltree_ordered.h to lib_SOURCES.