calculation of time left issues

[tildedave]

on move 40, the time calculation kicks in just after the clock hits 00:00

in general the way we are doing calculation sort of sucks. we use a lot of extra (unnecessary?) time calculating in the middlegame and don't have clock when we need it for tactics. not sure the best way to handle this.

[tildedave]

one easy thing that can be done: put TimeoutValue in search_options struct