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add dependency to ${perl:version} so that perl libraries will be rebuilt when perl version is updated.

proper cache plugin) rather than local dict.

Like SubversionClient, display a readable error message when git command could
not be executed.

Certificate authority is capable of getting "asynchronous" certificate
creation requests during buildout run, which are later processed one by
one.

Thanks to this recipes are able to request any amount of certificates,
the apache part will wait until certificates are really created.

This feauture have to be implemented on different level.

* no need to baseconvert because we already call convertFile.

As PATH is used to implicitly find binaries, restricting to partition's
PATH will disallow accessing any other resources.

Backend will know (somehow) list of possible frontends which are allowed
to access it -- and fully it.

Snippet for security per location is left for future frontend
implementation.

we no longer need postfix-hooks.py because our buildout uses Python 2.7 that does not have this tarfile bug.