don't reset dataset version on server reboot
fixes issue #107
JS prevents submissions lacking required fields.
Removed requirement for presenters from back end validation.
JS clears all hidden inputs before submitting form.
Fixed logo SVG viewbox.
Corrected the page title.
Merge pull request #109 from MattArnold/dontrequirepresenters

Removed requirement for presenters from back end validation.
Contextually hide and show the help-block text on form.
More refinements to the help text on the form.
Issue #110: Selecting track auto-adds a topic
Moved the View Rejected Submissions button to the bottom of index.html.