New method of date comparison in synchronizer

Fix of c5a83c75cc749b5d33dfc1cac4426d52ae18a161

Old method for comparing dates do not work properly (sadly I don't have
enough time to find cause).
Revert "make engine ignore facilities (for testing of new engine)"

This reverts commit 5876305d5eaae3c210beed7d08567038c98d520a.

This commit should not get to master branch.
Fix of typo in synchronize

 - fix of type when concating strings (need to use += instead of =)
Merge pull request #588 from stavamichal/synchronizationWorkflowFix

Fix of typo in synchronize
nested transaction for createMemberSync

Nested transaction for membersManagerBl().createMemberSync

It fixes problem caused by 09add5b4748d229187b30d27f75008b65fec5094
(New Synchronizer workflow) - There is caught exception from
createMemberSync wich is not throw out. Therefore there is no rollback
and by that the inconsistency in database is made (member is created but
he is not in members group).
Add fix to get correct information about group Synchronization

 - attribute has only 4000 char limitation so we need to save only
   messages with less than 4000 char (default will be on 3000 for save),
   other information need to be write to log.
Merge pull request #589 from stavamichal/fixSavingSynchronizationStatus

Add fix to get correct information about group Synchronization