Document Elo impact of the LMR part of search

Document Elo impact of the LMR part of search

Similar to before, document Elo impact of various LMR steps

Tests run by @jerrydonaldwatson

t1 http://tests.stockfishchess.org/tests/view/5abece950ebc591a560aad0b
t2 http://tests.stockfishchess.org/tests/view/5abecf0c0ebc591a560aad0d
t3 http://tests.stockfishchess.org/tests/view/5abecf7b0ebc591a560aad0f
t4 http://tests.stockfishchess.org/tests/view/5abecfe70ebc591a560aad14
t5 http://tests.stockfishchess.org/tests/view/5abed42b0ebc591a560aad33
t6 http://tests.stockfishchess.org/tests/view/5abed0b90ebc591a560aad19
t7 http://tests.stockfishchess.org/tests/view/5abed1240ebc591a560aad1b
t8 http://tests.stockfishchess.org/tests/view/5abed1b90ebc591a560aad1d

No functional change.