Added more information into exception in UF:V:login
 - exception now carry important attributes
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.).
GUI: support for CESNET's linker form item

 - if form item with div#cesnet_linker_wrapper is found. It's moved in DOM and loading
   script is appended. Also GUI is moved down to reserve space for linker.