CONTRIB 3525 Added "skip logic"/"conditional branching" feature to Questionnaire.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
Various fixes and improvements.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
WIP various CSS fixes

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
Conditional branching almost done.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
WIP

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
WIP ...

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
WIP...

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
Ready for github

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>