New feature - Public form to request account

* An option in admin Lizmap > services to activate/deactivate it
* A new item when not logged in lets the visitor access the form
* An email is sent to a configurable admin e-mail for each request
Edition - replace annotation by edition
Finalize edition tool

* completely remove annotation files and references
* modify demonstration montpellier project
* add tooltips to action buttons
* add edition actions into logs
Change project and modules version number into 2.8.0
Set Version 1.9.0pre
Debug metadata link in legend
Debug metadata link in legend BIS
Edition - debug selection for negative bbox params
Edition - debug Postgis selection