Correctly handle http errors (register and tags)
Change add-with-none message to none rather than add
Don't treat remove empty measure as error

Fixes #2597
Don't save fields if they haven't changed
form style changes
Merge branch 'master' of github:databrary/databrary
Fix raw html error reporting
Catch date format SQL errors
Improve measure update errors

Fixes #2595
fix inpu and select spans in spreadsheet, post switch to multiple
Merge branch 'master' of github:databrary/databrary
trying out ie-specific stylesheet....
Add no-cache control header to most api responses

This makes me rather uncomfortable, but it does make logical sense, and
should hopefully fix #1059
Maybe classList.add doesn't work with multiple arguments?
Attempt to fix multiple-file drop

Untested since no dnd for me
Fail hard in dev mode

Though maybe should be only in debug mode instead, if we have another
reason to add uglify DEBUG.
Interceptors are close enough to decorators