Some fixes - #53

PFA a PR with 2 commits:

• first one fix trivial issue in conf_file parsing (noticed while using the provided example file)
• second one fix substitution issue I saw with a real dump today. FTR, here's a test case to reproduce it:

ALTER TABLE [dbo].[foo]  WITH CHECK ADD  CONSTRAINT [CHECK_BAR] CHECK  (([DT_START]>[DT_BEGIN]))

was giving:

ALTER TABLE "foo" ADD CONSTRAINT "CHECK_BAR" CHECK (DT_START]>[DT_BEGIN);

now gives:

ALTER TABLE "foo" ADD CONSTRAINT "CHECK_BAR" CHECK (DT_START>DT_BEGIN);