parser adjustments

cobc/parser.y:
* (symbolic_characters_clause, class_name_clause): improved parsing, adding _alphnat_target and first checks for it
* (_is_locale_name, _in_alphabet, _alphnat_target): fixed missing return value for "empty" matching
* parser.y (figurative_constant): moved out of existing rules

HACKING

@@ -28,7 +28,7 @@ If you want to update to a newer automake/libtool version or get errors
 about wrong version numbers in m4 run "autoreconf -vfi -I m4" instead.
 
 For compiling (when changing flex/bison sources):
-  o Bison 2.3     (will be changed to 3.x with GnuCOBOL 4)
+  o Bison 2.3     (will be changed to 3.6 with GnuCOBOL 4)
   o Flex 2.5.35
 
 For generating the testsuite (when changing any .at files):

cobc/ChangeLog

@@ -1,4 +1,12 @@
 
+2022-10-06  Simon Sobisch <[email protected]>
+
+	* parser.y (symbolic_characters_clause, class_name_clause): improved
+	  parsing, adding _alphnat_target and first checks for it
+	* parser.y (_is_locale_name, _in_alphabet, _alphnat_target): fixed
+	  missing return value for "empty" matching
+	* parser.y (figurative_constant): moved out of existing rules
+
 2022-10-05  Simon Sobisch <[email protected]>
 
 	* typeck.c (cb_check_field_debug): fixed bug introduced with last change