Convert pathoGen to multi-process

Change-Id: I9de5c59ff2180d7f59a4a153f4aa64e531a23d21
WIP: Add stats of how many promotions of each size

Change-Id: I914c6650884a20de21cfb80feb1f3818c638c947
CLEANUP: WIP changes for skipping docs

Change-Id: I11c39b99fa8804d71a78ed8e4154489d8883aef6