docs: stepCountingHillClimbing in table overview + tennis play colors
(cherry picked from commit 888e39450a3ec082ead35f39cdff7763d314386a)
fix bug in docs + RandomUtilsTest
(cherry picked from commit 4f68e5caefa6336648771937a38832885322b048)
PLANNER-207 SimpleBigDecimalScoreHolder and HardSoftBigDecimalScoreHolder throw NPE
(cherry picked from commit ff51765e5916592c45fd2f8a5b1fd2b0a0c88c2e)