Call fixConsistency directly is enough
Put back install dependency property because it should be used by Standard BT5 Configurator Item
Revert script to install all bt5 by activities and return Constraint
Messages instead of strings
Reindex ERP5 after all configurator steps

Before it was done through Standard BT5 Configurator Item, but now it
should handler only Business Template installation.
Set property to allow install Business Template dependencies