This reverts commit 18402f9f.

This reverts commit 3e54ec0c.

Use slapos.extension.strip instead.

This reverts commit f26567c4.

  And it is also backward compatible with buildout<2 and with current tests

It looks even better to change the default value on Download.__init__()

And something should also be done not to cache something local.

This reverts commit 3fddde03.