[dev] [en] SSL certificate: which one ?

[Goffi]

G'day,

as Souliane as implemented https support in Libervia, we now need a certificate 
for libervia.org serveur/Libervia instance. I'd like your advices for the 
following options:

- self-signed certificate:
	PROS:
		* free
		* easy and quick to do
	CONS:
		* can't do authentification
		* warning in browsers
		* not accepted in xmpp.net security test

- CAcert (https://www.cacert.org/):
	PROS:
		* free
		* based on community, not commercial, more on less in the spirit of 
SàT
		* accepted in xmpp.net security test
	CONS:
		* warning in browsers
		* recently removed from Debian and Ubuntu, its seems that there are 
some security concerns according to the bugs comments 
(https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718434)

- StartSSL (https://startssl.com/):
	PROS:
		* free for Class 1
		* no warning in browsers
	CONS:
		* Non commercial use (SàT is not commercial, but as we are planing 
to create a cooperative and to have salaries, we must check the terms of use)
		* only one domain and one subdomain
		* free certificate is 1 year only (but it can be renewed)



OK, so what's you opinion ? Do you have any other option ? It's possible to 
have a self-signed certificate first, and change later.

Cheers
Goffi