Rename project

There is already a project called gcli. This is confusing for people willing to install it from Debian official repositories, because they get something else.

Already reported two times:

• https://forum.duniter.org/t/apprentis-forgerons/10665/63
• https://forum.duniter.org/t/utilisation-de-gcli-en-mode-non-interactif/13011/7