postgresql connection strings: support "sslmode" parameter

[jmacnett]

In short, was attempting to connect to an Azure postgresql instance, which i was able to do via psql on the command line, but got "28000: SSL connection is required. Please specify SSL options and retry" from Querytree's "Test this connection" button. There are options here for SSH, but the only immediate difference I'm seeing between the command line psql call and what I've configured in QT's UI is the lack of the "sslmode=require" bit. Can we get sslmode as an option?

Thanks.

[stale]

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