Add some features making LOVD more customizable, leading to fewer differences between installations

[ifokkema]

Within the LUMC, we have a few LOVD3 installations with differences in the code. Let's fix these so we won't need different code bases anymore.

• Add feature disallowing submitter registration
  • Add setting to CONFIG TABLE (inc-sql-tables.php, inc-upgrade.php)
  • Add setting to form, mention the options through messages as well.
  • Made link on template disappear.
  • Make form disable registration (creating a user should still be possible!)
  • Write tests.
• Add feature allowing, between certain dates, a message on top of every page.
  • Messages should have:
    • Start date, End date
    • Message type (info, question, warning, stop)
    • Message body
    • Make LOVD read-only
  • Create table in inc-sql-tables.php and inc-upgrade.php.
  • Add table in inc-init.php.
  • Create object that handles this data type.
  • getForm(), checkFields().
  • VL, VE.
  • Create link in setup.php and for Setup tab.
  • Make template display the messages.
  • Enforce read-only setting.
    • Block login for lower than manager and end current sessions.
    • Block submitter register.
    • Decided for now to not force disallowing edits. Also no warnings will be shown on forms; Managers will now best what (not) to do, considering the announcement that they made themselves.
  • Write tests.
• Describe these features in the manual.
  • New setting to disable submitter registration.
  • Subsection or chapter on messages.