reformatted data-pivot models code, and updated help-text for settings field
removed unique requirement for slug as it may not be unique

for different assessments
specifying a dose-unit for animal bioassay data-pivot no longer required
update excel download for data-pivot to include all rows, not just the first
added subcutaneous injection as a route of exposure and change capitalization
expanded generation options to F4; changed capitalization
disabled html5 numbers spinners in Firefox
Merge branch 'dev' into invitro