Use p.ap.versioningbehavior from 1.1.x branch and

Products.CMFEditions not from source any more.

(cherry picked from commit ec472365a76525a0e06950127790815a4287c902)
Don't set a value for `receipt_date` when migrating mails in upgrade step.

(cherry picked from commit b04443168aaf40e281a4a3a7f78c5f523df88340)
Create savepoints every 500 items during expensive upgrade steps for public_trial upgrade.

(cherry picked from commit 792d3197bdacf98bfb26e97236b8353ee7d78f14)
Merge pull request #515 from 4teamwork/lg-backport-fixes-before-releasing-3.4.0

Backport last fixes before releasing 3.4.0