Update description of admin roles
Merge branch 'master' into docs
Merge branch 'master' into docs
Merge branch 'master' into docs
Add support for record locking (no record releases yet)

Add support for record locking when editing records.  (In progress:
locks are not yet released.)
Merge branch 'master' into record-locking
Add support for record locking.

Closes #14

Add support for record locking when editing records.  Acquire lock
before showing edit screen, release lock after Save, Cancel, or
Delete.  (Completes support initiated with previous commit to this branch.)
Merge branch 'master' into record-locking
Lock record when confirming deletion requests
Fix lock release after record deletion
Support record locking around edit and delete actions

Closes #14