Rolled back on WRequest and lock system
Added an automatic signature to each form at the View rendering

The request variables will only be accessible for the targeted form
Linked the "triggered_action" to the $model array
Fixed an issue in the form_signature assignation in WRequest

Now uses the $_REQUEST global array (used by default in WRequest) to
store the value
Formats the model in WRetriever - simplified /m/

$model always contain app-name, triggered-action, notes
Retrievers'notes are now displayed in the same page

Fixes a conflict that could exist between two notes generated from the
same retriever in the past.
Merge pull request #80 from Creatiwity/form-context

Contextualized forms - fixes #79