Allow multiple --table options to be specified on the command-line.

Per Issue #18. SimpleStringList code borrowed from pg_dump and a
pending patch to add similar functionality to pg_restore,
clusterdb, vacuumdb, and reindexdb.

The error handling in reorg_one_table() could still be much improved,
so that an error processing a single table doesn't cause pg_reorg to
necessarily bail out and skip further tables, but I'll leave that for
another day.

bin/pgut/pgut.c

@@ -384,6 +384,40 @@ parse_time(const char *value, time_t *time)
 	return true;
 }
 
+/* Append the given string `val` to the `list` */
+void
+simple_string_list_append(SimpleStringList *list, const char *val)
+{
+	SimpleStringListCell *cell;
+
+	/* this calculation correctly accounts for the null trailing byte */
+	cell = (SimpleStringListCell *)
+		pgut_malloc(sizeof(SimpleStringListCell) + strlen(val));
+	cell->next = NULL;
+	strcpy(cell->val, val);
+
+	if (list->tail)
+		list->tail->next = cell;
+	else
+		list->head = cell;
+	list->tail = cell;
+}
+
+/* Test whether `val` is in the given `list` */
+bool
+simple_string_list_member(SimpleStringList *list, const char *val)
+{
+	SimpleStringListCell *cell;
+
+	for (cell = list->head; cell; cell = cell->next)
+	{
+		if (strcmp(cell->val, val) == 0)
+			return true;
+	}
+	return false;
+}
+
+
 static char *
 prompt_for_password(void)
 {