Instrument results with to mongoDBObject conversions.
Report compile results.
More toMongo conversions.
Add Instance handles for gridfs ops.
Use MongoDBInstance to hold pair mdb-gridfs
Update problemdb to use object store.
Delete unused code.
Use maybeCompile function.
Rename some vars.
Switch invoker to SimpleApi everywhere.
Refactor StatusPageBuilder (delete it).
Move url normalization to proper place.