Rudder

In directives, we have a "priority" field that allows to choose what directive must be chosen for a non-multi instance technique.

That field is a select with choices: [0,1,2,3...,10]

And 0 is the most prioritary, ie the one directive that get chosen. Appart from some computer scientist using cons list all day, this is strange.

We need to change that to something more understandable. I propose:

Priority: 

[ default ]
 ---------
| highest |
| +4      |
| +3      |
| +2      |
| +1      |
| default |
| -1      |
| -2      |
| -3      |
| -4      |
| lowest  |
 ---------

Of course, in the backend and database, nothing change (ie we still map toward integers from 0 to 10, most prioriterary = 0)