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.