…ly match how UCI hosts measure time. (LeelaChessZero#427)

* Allow hiding options from help and UCI

* hide time curve options

* add (hidden) --show-hidden option

* add search_deadline to use instead of time_ms (

* time_ms renamed to movetime

* change nps estimation for smart pruning

* Implement better logging.

* Support <stderr> as special name of a logfile.
Also increase move overhead limit to ~27 hours to support playing by
fax.

* Also output buffer when using stderr.

…ChessZero#471)

…ault. (LeelaChessZero#472)

* Prevent search from overflowing by setting limits.visits to 4B by default.
Also while `go infinite` never responds bestmove by itself, it still stops search when reaches the limit.
E.g. it's possible to do `go nodes 100000 infinite` now. (Not sure whether useful, but just a side effect)

* Output warning when search doesn't make progress and not allowed to respond bestmove.

* Update help.
From https://docs.google.com/spreadsheets/d/1R8tgbnV5MGUhLqS-e2Qy5yx2-9E0ZuaYxbLXuIc8xso/edit#gid=0

* Forgot to delete commented line.

* Addressed review comments.

…Zero#477)

* Make most of std::cerr outputs also get into the log.

* More logging.

* More timer logging.

* Do not use suffixes.

* Build fix for older VS.

* Implement RAM limit.

* Add RAM limit related logging.

* Address review comments.

* add benchmark mode

* minor network load refactoring change

* remove movetime from limits

* print search_deadline in SearchLimits::DebugString()

…ero#305)

…y-propagation-negabound