doc2sdl: use POSIX regex functions.

cde/programs/dtdocbook/doc2sdl/instant/TODO

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+#
+# Copyright (c) 1994  
+# Open Software Foundation, Inc. 
+#  
+# Permission is hereby granted to use, copy, modify and freely distribute 
+# the software in this file and its documentation for any purpose without 
+# fee, provided that the above copyright notice appears in all copies and 
+# that both the copyright notice and this permission notice appear in 
+# supporting documentation.  Further, provided that the name of Open 
+# Software Foundation, Inc. ("OSF") not be used in advertising or 
+# publicity pertaining to distribution of the software without prior 
+# written permission from OSF.  OSF makes no representations about the 
+# suitability of this software for any purpose.  It is provided "as is" 
+# without express or implied warranty. 
+#
+
+Stuff to do:
+
+    Add param to _nchild - gi.		??
+
+    Tables
+
+	Consider having _osftable do the entire table, just calling it
+	for each call and row.
+
+	More work on tables, in general.  (try more test more cases, etc.)
+
+	Document _osftable special variable better.
+
+    Use message catalogs.
+
+    Investigate translating StartText/EndText escapes (\n, etc.) as they are
+    read, not when processing.
+
+    Keep a list of SpecID's.  Right now we search all specs in FindSpecByID().
+
+    a test suite
+
+    PI mapping - document how it works
+
+    faster trans spec lookup (hash buckets?)
+
+    Info option:
+	in summary, total and avg char data in for each elem type
+
+    when malloc'ing structs of a linked list, do N structures at a shot?
+