Calendar is broken

[vankeisb]

Easy to reproduce :

$> cd /tmp
$> woko init
... // create "test" project with all options to Y
$> cd test
$> woko start

Then log-in as wdevel and create a MyEntity object. Then try to change the date etc. It doesn't work as expected.

We might wanna roll-back to the jqueryui calendar... Looked more robust !