+ * Revision 1.22 1998-06-24 12:16:10 adam
+ * Support for relations on text operands. Open range support in
+ * DFA module (i.e. [-j], [g-]).
+ *
+ * Revision 1.21 1998/06/22 11:33:39 adam
+ * Added two type casts.
+ *
+ * Revision 1.20 1998/06/08 14:40:44 adam
+ * Fixed problem with signed character(s) in regular expressions.
+ *
+ * Revision 1.19 1998/01/12 14:39:39 adam
+ * Fixed bug in term_Tnode.
+ *
+ * Revision 1.18 1997/09/29 09:05:17 adam
+ * Thread safe DFA module. We simply had to put a few static vars to
+ * the DFA_parse structure.
+ *
+ * Revision 1.17 1997/09/18 08:59:17 adam
+ * Extra generic handle for the character mapping routines.
+ *
+ * Revision 1.16 1997/09/05 15:29:57 adam
+ * Changed prototype for chr_map_input - added const.
+ * Added support for C++, headers uses extern "C" for public definitions.
+ *
+ * Revision 1.15 1997/02/10 10:19:20 adam
+ * Added facility for open character sets, eg [a-].
+ *
+ * Revision 1.14 1996/10/29 13:57:22 adam
+ * Include of zebrautl.h instead of alexutil.h.
+ *
+ * Revision 1.13 1996/06/17 14:24:08 adam
+ * Bug fix: read_charset didn't handle character mapping.
+ *
+ * Revision 1.12 1996/06/04 10:20:02 adam
+ * Added support for character mapping.
+ *
+ * Revision 1.11 1996/01/08 19:15:24 adam
+ * Allow single $ in expressions.
+ *
+ * Revision 1.10 1996/01/08 09:09:17 adam
+ * Function dfa_parse got 'const' string argument.
+ * New functions to define char mappings made public.
+ *
+ * Revision 1.9 1995/12/06 12:24:58 adam
+ * Removed verbatim mode code.
+ *
+ * Revision 1.8 1995/12/06 09:09:58 adam
+ * Work on left and right anchors.
+ *
+ * Revision 1.7 1995/11/27 09:23:02 adam
+ * New berbatim hook in regular expressions. "[]n ..".
+ *
+ * Revision 1.6 1995/10/16 09:31:25 adam