Attempting to added board post_count and thread_count

* Partially working. Numbers are off and tests are failing wip.
Fixed handler and sort of readstream for boards.all
Completed add of board view total post/thread count

* Patched tests to create board/thread/first post for each thread
related test
* Rebased master changes on top of board metadata changes
User import function on the index level.
Users find by legacyId.
Find by legacy id for users

- key generation helpers structured in users to be class methods