MBS-1839, Include work types in webservice test data dump.
MBS-1839, more track identifier database changes in the form of update scripts.

- Re-introduce track_count column (on medium, previously on tracklist).
- Update triggers to keep track of the track_count.
- Initialize medium.track_count with correct values (20130305-update-medium-track-count.sql)
- Remove search_path wrangling from script/release-group-sql-dump.pl
- Initialize medium.track_count with correct values (script/release-group-sql-dump.pl)
MBS-1839, code changes to remove the tracklist entity (pass WS::2::JSON::LookupRecording test)
MBS-1839, Replace t/sql/webservice.sql with a new dump from the new schema layout.