Also,
- Add diff function for Busienss Item objects

BusinessManager: Update Business Manager path_list whenever we edit Business Item via Business Commit

We do not configure portal_actions and views properly hence there are lot many bugs in views
after installation.

Business Manager: Introduction of Business Manager class and changes in template tool according to it

BusineeTemplate: Add fixes for Business Manager installation to work with BT installation during bootstrap

(fix: e46ade7a)

(fix erp5.git/eb5f1fb1)

As it is a common pattern to set validators on hidden fields
to display custom errors to users.