we don't have access to files yet so we'll just assume we're adding for
the tie being.

insert the form action earlier in case set validation fails

This reverts commit ee16a54d.

in order to display the correct header for forms

an id was being passed as unicode when editing an element (due to json
decoding).

so forms can't be inadvertantly submitted by pressing "enter"

Feature cs/multi-upload : generic forms for batch creating sets and uploading samples

Closes #3073, #3017, #1362, #2963, #2976, #3046, #3045, #3044, #3016, #3006, #2997, #2979, #2977, #2746, #2896, and #2948

See merge request !167

Mikaël Salson authored Mar 20, 2018 and Ryan Herbert committed Mar 21, 2018

It should be better to have the add buttons before the form rather than after.
When they are after they move each time a row is added. Therefore if one knows
that s⋅he needs 10 samples, s⋅he couldn't click 10 times quickly on the link,
s⋅he had to click, wait for the new row to appear, adjust the mouse position,
click, and so on…

Prevents the form from expanding if the filename is too long.

Redirects the user to the list of sample types they most likely came
from when adding files.