Tag a new release from what seems to be ok version

As a first step, I would propose a new release 0.0.6 which

• is based on the ref 85877fd2 (an older version of the unstable branch that currently installed in the pleque/unstable module)
• implements small changes described #66 (closed) that by themselves do not change any functionality

Then, the more interesting stuff such as #65 (closed) can be addressed in later patches.