Export workflow tidying

Added headings for formatting fieldsets, “unsaved changes” badge,
duplicate form buttons at the top, hiding of PDF formatting fields and
status message when PDF is not selected.
Export workflow tidying

Added headings for formatting fieldsets, “unsaved changes” badge,
duplicate form buttons at the top, hiding of PDF formatting fields and
status message when PDF is not selected.
Merge branch 'Export-options-presentation' of https://github.com/DigitalCurationCentre/DMPonline_v4 into Export-options-presentation
Merge pull request #118 from DigitalCurationCentre/Export-options-presentation

Export options presentation