Initial release based on SQLite registry

Alpha pre-release supporting major feature update. This release is not backwards compatible with previous releases, and requires the data files be re-imported.

• File locations are now tracked in a repo.db registry such that the files can be located anywhere. The information from the json sidecar files are also included in the database.
• Ontology terms are now imported via an OBO file instead of the old pre-packaged sequence_ontology.txt file. A sample OBO file has been added to the sample data set for the reference server.
• Added a custom landing page option for the main page of the server.
• Performance improvement for variant search when calls are set to an empty string.
• Improved server configuration including Apache configuration and robots.txt file.