adding new query sequences dynamically

[jjgao]

Currently, we need to rebuild/re-initiate the whole database from scratch in order to update to a new UniPort release. We should really eliminate this step.

• support adding new query sequences into the database
• when a new sequence (or a new uniprot/ensembl id) is queried, the alignments will be stored
• the new query sequences will also be used for the weekly update to the PDB data

Once that's finished, adding a new sequencing (or uniprot entry) is just about querying the API once.