Bring back just bishop pins
Simplify eval take 2.  Bench 5097444
Bishop pins only
Merge branch 'master' into simplify_eval
Add clop parameters
CLOP tuned
Merge branch 'simplify_eval' into bishop_pin_clop
Use CLOP mean value instead of max
Revert "Use CLOP mean value instead of max"

This reverts commit d0c2faa5fd9ad05f865d2a69b59efab43b2be421.
Merge branch 'master' into bishop_pin_clop
Add new clop tuned value
Back to CLOP average values
Update copyright year

No functional change.
Bring back original bonus
Merge branch 'master' into bishop_pin_clop
Print leading zeroes in hash keys

And convert to uppercase. Reset the stream to dec too.

[Edit: Also fixed the hash key in Position::pretty()]
Merge Gary's bishop_pin patch

Give a bonus if a bishop can pin a piece or can
give a discovered check through an x-ray attack.

Seems good after 24000 games at 15"+0.05 (single thread):

ELO: 12.30 +- 99%: 5.79 95%: 4.40 LOS: 100.00%
Total: 24000 W: 4931 L: 4082 D: 14987

bench: 4917064
Merge branch 'master' into singular_tweak4