clean up CHUNK_SIZE globals
do not square chunk_size...
avoid extra request per call of UnknownUsersPillow
improve ptop fast reindexer logging
add logging around fast reindexer view requests

and log the dump file names
minor cleanup of ptop_fast_reindexer
add log for sending chunk to ES
condense full_couch_view_iter
do not skip gevent patch thread in ptop_preindex

this change fixes the following behavior:
- ptop_preindex hangs after starting a couple greenlets and never finishes
- you cannot ^C out of it
add paginate_views using startkey_docid to paginate

and use it in ptop_fast_reindexer
refactor overrides of full_couch_view_iter to use paginate_view
Revert "Revert "Revert "Revert back to old ES case index"""

This reverts commit dfdc098d2688cc05469014fb880d52c4aeaf05e7.
increase reindexer chunk size to 100,000
Merge branch 'master' into ptop-reindex
fixes to running ptop_preindex locally

- reduce chunk size to 10000—I believe this may have been part of the
original problem and it causes ES timeouts locally
- have manage.py _always_ apply gevent patches

this second thing is site-wide, so while it won't affect workers at all
(which already applied these)
change CASE_INDEX hash
do not use gevent with manage.py compress
Merge pull request #4775 from dimagi/ptop-reindex

Better, faster, ptop_preindex