[m-rev.] For review: variable bindings in interactive queries

[Mark Brown]

Hi,

This change lets interactive queries in mdb use variable bindings in
the current environment, a feature which came up on the users' list
recently.

I have tested this by hand, but haven't written test cases yet because
I'm not sure the proper way to run the tests so that the interactive
query tests are included. Building the test case by hand then running
it through bootcheck results in link errors related to shared linkage
(interactive queries requires shared linkage). Any help?

Cheers,
Mark.
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