ajouté option d'export CSV pour le tab analyse
déactivé accès à "Mes Images" et "Nouvelle Image" dans navigation

- ajouté main navbar sur home page quand loggé
- ajusté css
- mis dropdown en sombre
- ajouté lien pour site admin dans menu pour les membre staff

Missing intermediate commits with good comments....

DRF:
	Updated permission check for Annotation (compatibility with v3.*) using PermissionClass
	Added a TTPAuthentication class (adim_ttp.authentication.TTPAuthentication) so api call can be done without user token

AnObj Manager:
	Updated the properties panel for TTP shared object: the link for editing the object in the distant service is more visible

TSD ...

Note: there is no user interface for editing the owners list.
It is supposed to be done through the API (to be done)

Not activated by default

Updated Lock button too 

AnObj sharing and permission at Backend level
AnObjMgr in FrontEnd allow editing of the sharing
properties. Is able to liste shared AnObj

a field image_url added to AnObj
Image is loaded by a img tag with "crossorigin"
attribute set to "anonymous".
The paper.Raster object is build using the img tag
instead of the direct url. Also for local images.

Functions for Thumbnail creation and borders are 
now in adim_app.utils

Thumbnail creation and border are called at view
level from adim_app (no more in models)

Thumbnail size in settings, no more hardcoded

Image and thumbnail URLs are now seen as
"sub pages" of the annotable 

image     .../<anobj_uuid>/image/
thumbnail .../<anobj_uuid>/thumb/