flexitest client script adaptation
treeview selected method change

+ nodeClick event publish
+Treeview multiple select support
+ plugin CheckBoxTV -> treeview toggle selection
+ plugin CTRLSelectTV -> multiple select with CTRL key
Merge branch 'master' of github.com:Heigvd/Wegas

# By Yannick Lagger
# Via Yannick Lagger
* 'master' of github.com:Heigvd/Wegas:
  Fix last commit
  CSS Print for app, mcq, cep