N.520 Setup: conflicts when a module in "extensions" is an upgrade of a module that already exists in datamodels/2.x. The most recent module must be installed and the older one must be ignored.
N.520 Setup: conflicts when a module in "extensions" is an upgrade of a module that already exists in datamodels/2.x. The most recent module must be installed and the older one must be ignored.

git-svn-id: 8a2b0a969c74f87a9c14cf35f460fb9b394f82c6@4477 a333f486-631f-4898-b8df-5754b55c2be0

changi67/itop,changi67/itop,changi67/itop,changi67/itop