[enh] Help: add terms in the glossary: WoT and distance rule.

[enh] Increase size of avatar, on Cesium+ profile
[fix] Fix cesium+ profile geo-point, when changing city (see gchange issue #70)

[fix] Display a specific message if not a member anymore, because membersjip cancelled for lack of certifications - fix #649
[enh] Better message when new membership, and waiting for certifications