Transform skill level to textual skill level

Fix #370
PMG bac refactor

*Fix #363
*input onchange event instead of onkeyup and remove timer.
*Use input instead of inputex
+Highlight false input
-Bad input reset
-Datasource duplicate update event
Merge branch 'master' of github.com:Heigvd/Wegas

# By Anthony Geiser
# Via Anthony Geiser
* 'master' of github.com:Heigvd/Wegas:
  Add GUI toolbar in rich text editor (bold, italic and underline)
  Persistent tooltip
  Add buttons to edit arrows
  Add images in arrow editor