Fix of checking existence of group when creating new one

- add parentGroupId to checking of group existence
- add test for two same groups with the same name,parentGroup and voId
Added more information into exception in UF:V:login
 - exception now carry important attributes
GUI: Enable GWT 2.6.0

- Update GWT 2.5.1 -> 2.6.0
- Added ie10 permutation.
- Should bring better performance and stability
  to both dev-mode and runtime.

- Fixed issue in PerunAttributeCell when event.currentTarget
  was not filled by jQuery, but was required by GWT to handle
  events. So now removing value from list/map attributes in
  table correctly calls update to the attr object itself.
- Source format of PerunAttributeValueCell.
Merge pull request #261 from zlamalp/gwt26

GUI: Enable GWT 2.6.0
GUI: prevent doubling exception ID

- Do not display error ID in report widget twice (as part of heading).
  ID is displayed by UiElements.generateAlert() itself.
Merge pull request #263 from zlamalp/fix

GUI: prevent doubling exception ID
Merge pull request #258 from papperwing/attributeHolders

- Added more information into exceptions in UF:V:login.
- Prefer throwing WrongAttributeValueException instead of WrongReferenceAttributeValueException
  since in module, we can tell if:
  - facility's namespace is empty (login can't be determined) or
  - user doesn't have login in facility's namespace (null or non-unique). 
 Other cases are handled by standard exceptions (Consistency, AttributeNotExists etc.).
Merge pull request #250 from stavamichal/create_group_existence_checking_fix

Fix of checking existence of group when creating new one
Fix bug in delay of repropagation of tasks in DONE

Tasks in DONE should be repropagated each 2 days unless some event
trigers it earlier. Because of faulty constant they were repropagated
each 48 minutes.
Inicial import of perun slave services
SERVICES: added scripts for LDAP support

- Added gen/slave scripts for LDAP service.
- Added ldifdiff a ldifsort scripts from CPAN contrib used by our slave script.
- Added empty pre script with local settings about ldap (authz)
- Added password manager for LDAP (can be used on it's own or by our default pw-manager).

For service LDAP to work, destination LDAP must have included schemas:
"inetUser" and "perunEduroamUser".
SERVICES:  enable ldap service in main script