Update CTD code to load models into database

[balhoff]

Currently the CTD code creates models, applies reasoning, and writes large clumps of models to a series of turtle files. It needs to be changed to accept an existing Blazegraph journal file, and to write each model to its own graph (at least each top-level CTD "interaction") in the database (writing each to a file would produce too many files). Reasoning should be delayed until the whole database is reasoned over separately.

[balhoff]

Implemented on this branch: https://github.com/balhoff/ctd-to-owl/tree/database-load