Remove scheduler_error_mailer from __unported__.

--HG--
extra : rebase_source : 31c71350725cc03390b156b452ff3b92b90e291f
Make module installable.

--HG--
extra : rebase_source : 91f540ebbedce6face2e0491f0f99b64e8025bb4
Move icon.

--HG--
rename : scheduler_error_mailer/static/src/img/icon.png => scheduler_error_mailer/static/description/icon.png
Fix some formatting.
Only admin can send emails here.
Don't pollute other models just for testing this one.

--HG--
extra : amend_source : d3da15fc7b28f738dbef0e7a60044b4f71056b06
New translation template.
Fix assertion.

--HG--
extra : amend_source : 6d240dcaf7da6ecb618e6285c823fcc0387201d3
Merge