Branch overview:

branch_6.4     - up-to-date stable code, as of 2020.

branch_6.5 and
branch_7-alpha - preview code

branch_6.3-obsolete
               - historic code, not to be used any more.
		 use branch_6.4 instead, it is mostly
		 compatible, and see NEWS for required
		 configuration changes - mostly --sslproto.

Matthias Andree, 2020-08-28