Also clean up the old versions in the postinst as they are obsolete and
not needed going forward. These only ever served as reference for a
manual installation which itself is long-obsoleted, and thus can be put
somewhere less "important".
Add management of the pvcprov database with SQLAlchemy, to allow
seamless management of the database. Add automatic tasks to the postinst
of the API to execute these migrations.
Rename "pvcd" to "pvcnoded", and "pvc-api" to "pvcapid" so names for the
daemons are fully consistent. Update the names of the configuration
files as well to match this new formatting.
References #79
