so that we don't have to escape % as %%

Major change is that slapos compatible wrapper is no longer installed in
parts/firefox/firefox-slapos , but directly as "firefox" in the
buildout:bin-directory of the software profile.
geckodriver is also in the same buildout:bin-directory.
This way, softwares using this just need to add
buildout:bin-directory to $PATH

erp5testnode knows since
nexedi/erp5@59ee7970
that it should look for firefox in buildout:bin-directory of the
installed SR, so we should not need backward compatibility here.

Adjust seleniumrunner and jstestnode for the changes

Also drop unused firefox 45

Jérome changes from original 8cf6908df752b9e7632b2910ffc85027f1f4f22c :
 - name sections [firefox-wrapper] and [firefox] because including the
version in section name means we have to also update section name when
we update version. Users have to be careful of installing
${firefox-wrapper:} and not ${firefox:}
 - introduce macros for implementation and simple section using the
macros, to make it easy to had more versions or to increase versions,
for both firefox and geckodriver. They are slightly different because
for firefox we need a wrapper, but geckodriver is usable directly.
 - use same version, the "versions up" will be separate commits.
 - now that seleniumrunner and jstestnode are using buildout.hash.cfg,
md5sums are in separate files.
Co-authored-by: Jérome Perrin <jerome@nexedi.com>

  it  clean up....

  Up to some extent we would like to set diskcache=none and diskaio=native

This reverts commit 2c79bee1 because it depends on rdiff-backup version 1.3.4nxd4 which is not stable yet.

This reverts commit 9b3dfa01

On runner importer script, when updating database, set timeout to 5 seconds (same value as the default in python sqlite3 module: https://docs.python.org/2.7/library/sqlite3.html#sqlite3.connect). If database is locked by another process we wait a bit instead of raise immediately "database is locked". Importer script will raise if database is locked for more than 5 seconds.

/reviewed-on !384

they are already pinned in stack/slapos.cfg

When slapos.libnetworkcache is not installed, then shacache is not
enabled, so SR will no longer build when there's a dead link.

/reviewed on nexedi/slapos!379

See https://www.erp5.com/group_section/forum/No-test-results-rtSJ3H4fpC

/reviewed-on !382

https://github.com/v8/v8/wiki/Building%20with%20Gyp

aspell-en-dictionary, groonga-normalizer-mysql, file-msooxml, apache-antiloris are not shareable, they write files in other parts.

With new rdiff-backup version, it is possible to speed up push process by ignoring UID/GID changes (as it will always be different because of different partitions)

/reviewed-on nexedi/slapos!378

stack/slapos.cfg: Add slapos.extension.shared. This extension creates .shared file in software directory as a mark of software that was built with shared feature.

This usage of textwrap.dedent *sometimes* does not work and sometimes
create files with indentation, so we don't have "#!/bin/sh" as first
line but "    #!/bin/sh"

Use a "safer" version that should work in all cases.

perl path does not need extra /bin

See nexedi/jio@4b8bddba

Rework perl installation to install each package in a separate directory.

Each package install a `perl` interpreter for each package, which is implemented a shell wrapper setting `$PERL5LIB` with the path of this package and its dependencies.

To install a perl package, use `perl-CPAN-package` macro, like in this example for a fictional `XXX::YYY` package:

```
[perl-XXX-YYY]
<= perl-CPAN-package
module = XXX/XXX-YYY
version = 1.2.3
md5sum = ab68b329da9893e34099c7d8ad5cb9c940cd123
```

This will download package from https://www.cpan.org/modules/by-module/XXX/XXX-YYY-1.2.3.tar.gz and install using the usual `perl Makefile.PL && make && make install` sequence.

To install package with dependencies, use the `inc=` argument, like in this example for  another fictional package `XXX::ZZZ` package that would depend on `XXX::YYY` and `XXX::ABC` :

```
[perl-XXX-ZZZ]
<= perl-CPAN-package
module = XXX/XXX-ZZZ
version = 1.2.3
md5sum = 401b30e3b8b5d629635a5c613cdb7919

inc = ${perl-XXX-YYY:site_perl}:${perl-XXX-ABC:site_perl}
```

The full list of options is described in the [macro](https://lab.nexedi.com/nexedi/slapos/blob/a5bec95c/component/perl/buildout.cfg#L31-65).


That macro creates an interpreter for each package, but sometimes we need to create an interpreter with multiple packages. The `perl-wrapper` macro is available for this. It also accepts a `inc=` argument in the same format. Because this wrapper is implemented using `-I` argument, it is also suitable for scrips running in perl [taint mode](https://perldoc.perl.org/perlsec.html#Taint-mode-and-%40INC), like the w3-validator we are using.

All perl components and perl usages have been updated to this new infrastructure.

Some (apparently) unmaintained components were using an obsolete `slapos.recipe.build:cpan` recipe. They were used only in mioga2 from unstable, so I moved them inline in mioga2 software.

/reviewed-on !341

( mostly because old version is no longer on CPAN )

( mostly because old version is no longer on CPAN )

We stop using slapos.recipe.build:cpan , but these unstable components are
not ready and not being actively maintained, so move them inline in
mioga software, which was the only user of these components.

When the work on this is resumed, we should switch to perl-CPAN-package
here as well.

Generate a wrapper with all dependencies available

${perl:location} is now a perl without any package, components using
perl with one specific package must switch to using the perl with the
dependent CPAN packages installed.

Installing everything in site_perl is not the "buildout way" and is
incompatible with the upcoming shared slapos.recipe.cmmi