Fixing typo (worklow -> workflow)
Fixing bug with batch status update

Reversing test.
Improving status change mail notification

Adding a customizeable line describing each changed MD, by default using
the following syntax:
"* metadata title (metadata alternate title)"

Tests: manually with 2 MDs (one with title + alternate title, another
one with juste a title).
Taking into account FXP's feedback (PR458)

* Introducing the ability to add substituted values from outside of the
index (for now, only siteUrl, using serverurl in the templating
language).
* Removing altTitle from the default template string ;
* adding the URL of the MD by default ;
Merge pull request #458 from pmauduit/change-status-mail

Improve status email notification