Recommendation list:
* Focus on performance with silent state update (and no hook)
* Whole logic and componets working
* Updated few stuff in the back
* Complete validation of the recommendation list json content (and tests for most of it)
* Compute universities from the JSON on save

Fixes #34
Fixse #127

Tweaks:
* Reworked downshift multiple
* Reworked selected and multislect field to use downshift multiple when there are too many options
* Fixed wrong used of do_before_save
* Drop use of redux for filter; switch to static handling of part of the state: much more natural

Fixes #125

Other:
New components: CopyToClipBoard, LinkToUser, onBlurContainer, SimplePopupMenu
Updated SaveButton