[DS-1709] Improve clarity of access step UI

Clarify/fix default group selection

Show trail on access step
[DS-1707] Limit length of policy name
[DS-1706] Add review section for Access Step
DS-1745 : Change logic in InstallItem so that dc.date.issued MUST be specified to be set. Add an option to set dc.date.issued="today" to auto-apply today's date. Also add unit tests for new logic
DS-1745 : Backwards compatibility for Initial Questions. If item is "unpublished" and no issued date, set it to today's date.
Merge pull request #353 from aschweer/DS-1709-Access-Step-UI

[DS-1709] Access step UI
Merge pull request #373 from tdonohue/DS-1745

DS-1745: DSpace should no longer assign "dc.date.issued=[today]" when date field is missing