using "region of interest" increases the next number of visits every time

[Trevoke]

I am exploring a classical pro game. Here is what happened:

1. I set a region of interest around some of the suggested moves to get more work done in there, and got up to about 6k visits there
2. I set a region of interest around two intersections and it researched 14k variations before stopping (I hit space twice in relatively rapid succession)
3. I set a region of interest around a single unused intersection (three occupied intersections and one free one) and it put 18k visit into this one free intersection

I would have expected each "region exploration" to hold its own visit count, separate from the main board visit count. As-is, if I want to explore this board position in any way shape or form, whether it's two intersections or the whole board, I need to do over 22k visits, which I might not want to do.

[sanderland]

Yeah this is a side-effect of old versions requiring a visit count and 'pondering' being implemented as increasing counts. Probably it would be best to change pondering to have infinite visits + terminate on move change.

[sanderland]

Should be fixed with a significant rewrite in 136c461