OO-530,OO-537: as follow-up of the work in 8.3, remove some maps which are not really useful, remove more unused variables, remove the views and their mapping...

OO-522: this fix the most obvious issue with a course that takes too long to load and an impatient user

OO-271: refactor the user session management, move the the logic in its own manager, persist the time out values, make the admin GUI a bit better

OO-293: better back support in course (run), better switch between sites and dynamic tabs, better behavior after closing a tab (stack of previous tabs/sites not limited to 1 site)

OO-111: update business path in e-portfolio, improve back suppport, reenable full text search with jump to the right menu item in home, enable jump from notifications to the right menu item in home... refactor slightly the ContextEntry to enable rewrite of the business path before the jump

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branch : bps

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branch : uzhFixes711