Add model access rules

The product configuration was accessible for all users.  This has been
changed so that only users of the Product Administration group can
see the Product Configuration view and change the records in the model.
Merge branch 'develop' into 3.2

Merge the security fix that adds model access rules into the release
branch.
Release 3.2.1

Version number increase and change log update to bring the package
up to version 3.2.1.
Merge branch '3.2'

Bring the master branch up to date with release 3.2.1.