Change schema to enforce foreing keys

The foreign keys have 'ON DELETE CASCADE' to simplify the removal
of networks etc. (controller code)

Some unique constraints are replaced with a multi column primary
key.

To update an existing database:
 * install updated binaries
 * stop service
 * sqlite3 controller.db .dump | \
    egrep '((^PRAGMA)|(^BEGIN)|(^INSERT)|(^COMMIT))' | \
    grep -v 'schemaVersion' > data.sql
 * mv controller.db controller.db.backup
 * start service
 * stop service
 * sqlite3 controller.db < data.sql
 * start service

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