[development] Core scripts cleanup

[Khalid B]

Scripts should be broken down into two areas depending on their
different audience:

- Developers
Scripts like code clean and such are developer oriented tools.
Arguably, these belong to the devel module. That is definitely
a better place than the scripts directory of the base Drupal distro.

- Site Admins (who are non-developers).
This is where cron and other stuff belongs. Some of the oft used
stuff can remain the base Drupal distro, while other less used
or specific stuff can be merged into sympal.

As an aside, sympal uses command line PHP. This requires two
things that are not available for most users: ssh and php-cli. Is
that correct?