Stack is non instantiantable.

It seems better that vifib development will use erp5 development changes.

slapos.recipe.template has less dependencies than slapos.cookbook, which does
not force to compile lxml during recipe building.

slapos.recipe.template has less dependencies than slapos.cookbook, which does
not force to compile lxml during recipe building.

Imported from git://gitorious.org/vifib/slapos-master.git

Branch 'erp5' is used to work on ERP5 instantiation in SlapOS.

It is required to override-update command as section is being update.

As slapos.cookbook provides different modules it is required to correctly
select when egg is wanted and when its module selected.

This is workaround for SlapOS limitation of development environment.