OO-852: implements the new bulk assessment wizard, move the task executor and scheduler in the services package

OO-750: refactor the mail package to provide a MailManager as a service, enable sending HTML E-Mails, add a customizable E-Mail template with a small editor in admin

OO-531: more tree ajax implementation, fix decay in periodic poller as before, fix js error in statistics if there isn't any datas, fix the NullProvider for qpool

OO-531: work on date chooser, callout and dialog, replace last ajax tree, customize CSS from jqeury components to match openolat GUI

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-457: refactor tmp folder in OpenOLAT, use the java.io.tmpdir for all temporary files, configuration for absolute path for the indexer, fix deletion of temporary files in some archives, move qtieditor from tmp

OO-354: include first step to support oracle, openolat can be started, administrator can log in, update script from 8.1 to 8.2... (EXPERIMENTAL)

OO-291: first step: move business gourp manager to a business group service, remove dependency to the context...

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branch : bps