WIP: zope4 on python patches from Aurel (+changes from jerome)

build on zope4

wip : patches

update patches

reactivatee some patches & egg and remove dep to old ZSQLMEthod

fix zope patch

add Sessions product

reintroduce reStructuredText

use ExternalEditor compatible with Zope4

reinstroduce the config of _Z2PORT and _Z2HOST for testing

fix patch ?

add CMFDefault

Revert "add CMFDefault"

This reverts commit 3e3545ebd02fa188f4265301bbbf6b6b0f0dad9b.

pin eggs version

jerome: stop allowing version picking and pin versions