[Jool-list] Jool 4.0.0's fifth release candidate is now available

[Alberto Leiva]

It has been pointed to me that the new userspace interface warrants a
change in major version number for the sake of proper semantic
versioning.

Therefore, the fifth release candidate for Jool 4.0.0 is now available.

1. It adds support for $DESTDIR on the iptables binaries Makefile.
(https://github.com/NICMx/Jool/pull/272)
2. It applies latest feedback on atomic configuration:
2.1. It now supports static BIB entries. (But only if the operation is
being used to create a new translator instance.)
2.2. The JSON parser is more consistent:
2.2.1. Duplicate and unknown tags are no longer allowed on any object
contexts. (To make up for this, comment tags are now allowed on all
object contexts.)
2.2.2. The entirety of the JSON file is now expected to contain all of
the intended configuration at once; some sections are not incremental
anymore.

Details on Atomic Configuration can be found in the corresponding
documentation: https://jool.mx/en/config-atomic.html