Script to separate proxy from database URLs

Rather than hardcode the proxy (which is subject to being changed, often
mistyped, etc), we add a proxy boolean to the database content type.
This script makes the necessary updates to the tables to remove the
hardcoded proxy and populate the boolean attribute tables.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Merge pull request #2 from dbs/split_proxy

Script to separate proxy from database URLs
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