Merge RDBMS Database into Core Database

[eriq-augustine]

Issue by eriq-augustine
Saturday Aug 17, 2019 at 11:22 GMT
Originally opened as eriq-augustine#212

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I am getting tired of pretending that a Database is backed by anything other than a RDBMSDatabase.
There are quite a few places in the code where we force the use of an RDBMSDatabase,
so we should just go with it and make them the same thing.
This would put a lot of code in a single class, but that is typically the case with database-like classes.

Investigate this matter.