Loosen LMP pruning thresholds; trim stale comments/dead code in search.c

Raise uLMPStaticMaxPctThousandths across the board (200/200/150/75/50/
25/12/6/3/1/0 -> 325/300/250/200/150/100/80/25/6/1/0) and
LMP_DYNAMIC_MAX_PCT_THOUSANDTHS (1 -> 10000), letting the search go
deeper/faster by pruning more leftover moves per the dynamic FH%
evidence tables rather than the old hand-picked caps. Partial self-play
testing (two ~1k-game SPRT runs, LLR trending up both times, stopped
early) supports this but hasn't yet crossed +5 Elo.

Also: drop movesup.c's already-commented-out FLEE_BONUS selection-time
nudge (superseded by the evidence-gated countermove work), remove
search.c's now-stale dated commentary and two unused EFP flags
(fTryEFPHere/fThisMoveEFPPruned), and fix searchsup.c's beta-table
sentinel to use the named JOINT_TABLE_SENTINEL instead of a bare
0xFFFF.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

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