Login happens only with authentication informations, identity name is
now only used for legacy directory name. User name of authentication can
be changed. LDAP users can be imported with LDAP::ldapUid. Users can be
imported in courses, groups... with First name last name.

OO-3489, OO-3492, OO-3493, OO-3494, OO-3496, OO-3497: infrastructure to export user data, export  portraits, notes, personal folder, calendars, subscriptions, delete calendars after usser deletion

OO-1741 remove ? from dummy avatar images, adding anonymous avatar and removing old avatar images outside the theme

OO-1536: inline the user's visiting card in the different member list, add a tool in the list as in author list, add close button for the visinting card (if opened in the main window), add close button to the business groups tabs

OO-1068 OO-1113 more bootstrapify of forum, refactor redundant avatar image code, add forum attachment preview

OO-204: refactor the DisplayPortraitManager to allow portrait saved in PNG and using the new ImageHelper implementation

FXOLAT-431 : add link to VCard of mapauthor -> extend displayPortraitController to optionally display full name

--HG--
branch : bps