alter table users modify last_name varchar2(64);
alter table users alter column last_name drop not null;
Merge pull request #582 from zoraseb/users_lastname_nullable

alter table users modify last_name varchar2(64);
DB: Updated DB version in sql files comments to current
Merge pull request #586 from zlamalp/db

DB: Updated DB version in sql files comments to current
New Synchronizer workflow

 - synchronizer will synchronize only those extSource members with
   correct informations and attributes
 - method getCandidate from extSource and login will change firstName
   and lastName on null if in not correct format
 - methods createMember* will throw WrongAttributeValueException and
   WrongReferenceAttributeValueException instead of consistency
   exception, because this is not the same
 - new ParserException created for parser errors in Perun
 - method synchronizeGroup will return List<String> with info about skipped
   members and the reason why were skipped
 - method synchronizeGroups will set exception to attribute for this
   purpose to inform user about skipped extSource's members
 - when some problem occurs (like parserException,
   attributeValueException, candidateNotExistsException) in
   synchronization, member of extSource which create this exception will
   be skipped and information about this skipping will be add to
   attribute with info about last synchronization of group
Merge pull request #583 from stavamichal/newSynchronizerWorkflow

New Synchronizer workflow
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.