Dollar in identifiers

I'm not sure if it's according to or violating the standard.
But most other databases allow a '$' inside of identifiers.
Well, most of them recommend not to use it, but hey guy's,
what's a recommendation for a programmer?

In order to lower porting issues, I think it'd be nice to add
that to PostgreSQL as well. It's two more characters in
scan.l and doesn't break the regression test.

Objections?

Jan

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