Improvments to password change at login and password change in System Manager.

Changes to database and migration for driver licence info.

New maintain screen for Field of Service table.

Speed issues fixed on Finance Details tab in Partner Edit.
Merged from trunk.
Field of Service/Worker Field renamed to Gift Destination.

Personnel commitments updates Gift Destination.

Gift Destination displayed on Partner Edit for Person and Family.
Field of Service/Worker Field renamed as Gift Destination.

Unneeded Field of Service classes and dataset removed.

Gift Destination added to Partner Merge.
Merged from trunk.
Gift Destination added at migration.
Small bug fixes.
merge from lp:~peter-simpson/openpetraorg/dev_0000627_driving_licence_migration_part2