Simplifies editing the software release by removing the need to edit
instance-erp5-cluster.cf.in each time.
Applied to kumofs, cloudooo, mariadb and zodb.
Partially applied to frontend, as it is more complex.
Not applied to zope, as it is even more complex - but also topical to this
software release.
Also, change default timezone to UTC, to be neutral.
Also, reformat section extension.

Also, replace cloudooo-json by exposing its internals directly.

vincent: Minor fixes. Move branch switch to a separate commit.

Loosened checks are considered safe enough, and the speedup on many-GB
FileStorage files is significant.

Split line more naturally (don't separate switch from related argument).
Use long options instead of abbreviations.

older pod2man does not recognise --errors.
anyway we should just skip make in doc directory.

Buildout output is less scary this way.

Buildout output is less scary this way.

recent pod2man version does not work with wget documentation and make the whole compilation failed