obshashrange: warm the cache at the end of each transaction
This will help having warmed cache for read only client.
The warming is still imperfect in case of markers that trigger a reset, but we
are in a better place than what we used to be.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes