also fix includedir and Libs in libffi.pc.

Use compress for local transference is just slow.

  Use slapos.core 1.2.2 with fixes for slapos node collector
  Use new zc.buildout with fixes on eggs filesystem permission

to migrate other repositories containing product/ but no Products/, you can do like the following :

* remove Products from .gitignore if exists
* make a symlink Products -> product
* git add Products && git commit

if the repository has no product/__init__.py, you can copy from erp5/product/__init__.py.