Table on chart is not centered anymore #2129
Original series are dimmed to highlight alternative (dynamic) series #2129

We also heavily simplified the chart controller to do a full refresh,
in order to keep the color/style logic on the server side. The goal
mid-term is to have so sort of cache mecanism to mitigate performance
drawback.
Could not change question type anymore

Because Doctrine2 use Identity Map pattern we cannot load an object,
modify its type, and reload it with its new type. We must be extra
careful to load it only after type changed.

This also has side effect on unit tests where we cannot keep objects
used for DB populating. So we must clear Doctrine state and be extra
careful within tests when saving objects to database.
Add compulsory fields admin side and reorder fields
Change the way print css is managed
Use matching colors for original and alternative lines #2129
Expose excluded questionnaire in URL #2129
Could not change a question type back to Choice #2241

This was due to the list of choice which was wrongly pre-filled with an
empty choice instead of loading actual list of choice from server
Ignore empty choices when saving #2241

It used to crash when saving a question with an empty choice. For
instance if we hit "Add choice" button and left it empty. We now
completely ignore empty choices.
Fix print from the root of the current section that only was displaying current question instead of all section
Implements required fields compulsory backoffice side avoiding conflits when changing from question choice #2211
Set thematic and parts fields optionnal

These fields more advances and dont interpret correctly ng-required that needs to be dynamic
Use standard .gz extension instead of .gzip
Remove obsolete code
Introduce formula support during regression computing #2288

In order to accurately reproduce computing as seen in tab "Estimates"
of Excel files, we had to introduce an optional usage of formula
when computing regression values. This allow us to introduce dependecies
on other filters as seen in Excel files (eg: "Other improved")
Remove comment debug zone in questionnaire
Remove comment debug zone in questionnaire
Merge branch 'develop'
Correct bug on questionNumber and questionText cause empty choice.value was sent to server and crash on save
Merge branch 'develop'