b4_tables_map.

The point is to factor the generation of the tables across skeletons.
This is language dependant.

	* data/c.m4 (b4_comment_): New.
	Should be usable to define how to generate tables independently of
	the language.
	(b4_c_comment): New.
	(b4_comment): Bounce to b4_c_comment.
	Now support $2 = [PREFIX] for indentation.
	* data/lalr1.cc (b4_table_declare): Don't output a comment if
	there is no comment.
	Indent it properly when there is one.
	Output the ending semicolon.
	(b4_table_define): Space changes.
	Output the ending semicolon.
	(b4_tables_map): New.
	Use it twice instead of declaring and defining the (integral)
	tables by hand.

data/c.m4

@@ -21,14 +21,34 @@
 ## Identification.  ##
 ## ---------------- ##
 
-# b4_comment(TEXT)
-# ----------------
+# b4_comment_(TEXT, OPEN, CONTINUE, END)
+# -------------------------------------
+# Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
+# Avoid adding indentation to the first line, as the indentation comes
+# from OPEN.  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
+#
+# Prefix all the output lines with PREFIX.
+m4_define([b4_comment_], [$2[]m4_bpatsubst([$1], [
+\(.\)], [
+$3\1])$4])
+
+
+# b4_c_comment(TEXT, [PREFIX])
+# ----------------------------
 # Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
 # Avoid adding indentation to the first line, as the indentation comes
 # from "/*".  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
-m4_define([b4_comment], [/* m4_bpatsubst([$1], [
-\(.\)], [
-   \1])  */])
+#
+# Prefix all the output lines with PREFIX.
+m4_define([b4_c_comment],
+[b4_comment_([$1], [$2/* ], [$2   ], [$2  */])])
+
+
+# b4_comment(TEXT, [PREFIX])
+# --------------------------
+# By default, C comments.
+m4_define([b4_comment], [b4_c_comment($@)])
+
 
 # b4_identification
 # -----------------