Add %option nodefault to all our flex lexers. Fix a couple of rule gaps

Tom Lane <tgl@sss.pgh.pa.us>

Commit: fa96a5e15b69707c2e05aa04bc73fa88b9a85f7a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-02-24T22:06:32Z
Releases: 8.0.0
Add %option nodefault to all our flex lexers.  Fix a couple of rule gaps
exposed thereby.  AFAICT these would not lead to any worse problems than
junk emitted on the backend's stdout, but we should have the option to
catch possible worse errors in future.

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