justify: extend the quoting regex, to cover more types of comments

Now also comment blocks in Fortran, Lisp, Lua, Postgres, and TeX
can be rewrapped with ^J.

This partially addresses https://savannah.gnu.org/bugs/?55435.
Kind-of-requested-by: David Griffith <dave@661.org>

src/nano.c

@@ -2468,7 +2468,7 @@ int main(int argc, char **argv)
 	if (brackets == NULL)
 		brackets = mallocstrcpy(NULL, "\"')>]}");
 	if (quotestr == NULL)
-		quotestr = mallocstrcpy(NULL, "^([ \t]*([#:>|}]|/{2}))+");
+		quotestr = mallocstrcpy(NULL, "^([ \t]*([!#%:;>|}]|/{2}|--))+");
 
 	/* Compile the quoting regex, and exit when it's invalid. */
 	quoterc = regcomp(&quotereg, quotestr, NANO_REG_EXTENDED);