Bunch of 3 small patches

This patch is the sum of:

- Grainsize of 4 instead of 8

- Removing "depth < DEPTH_ZERO"

- Change DEPTH_QS_RECAPTURES = -5 to -7

All the patches individually failed to pass SPRT but scored
around 50%.

Together they pass easily short TC:
LLR: 2.96 (-2.94,2.94)
Total: 4429 W: 964 L: 844 D: 2621

And with some difficult long TC of 60+0.05:
LLR: 2.95 (-2.94,2.94)
Total: 64133 W: 11968 L: 11532 D: 40633

bench: 4821467
More uniform tracing code

No functional change.
Re-add "Pawn Structure" UCI option

And reshuffle the code to not special case
this parameter.

No functional change.
Add Pawn Structure also to polyglot.ini

No functional change.
Shrink engine UCI name

Some GUI have problems with long names.

Reported by George Speight.

No functional change.
Merge remote-tracking branch 'refs/remotes/MainFish/master' into master-3