For some pages, limit search to records w/ local machine id.

[ankurdesai]

With the large number of entries in many BETY tables with multiple synced machines, it would be nice on the web interface to only show entries belonging to the machine on which BETY is running. It can takes seconds sometimes to refresh screens when searching throughs 1000s of records for the 3 or 4 I entered somewhere and need to change.