Rename some UCI options

Thanks to Don, Miguel, Louis and the other people
of talkchess forum for the suggestion:

http://www.talkchess.com/forum/viewtopic.php?t=48612

Also sync polyglot.ini with current UCI options

No functional change.

polyglot.ini

@@ -14,7 +14,8 @@ ResignScore = 600
 
 [Engine]
 
-Use Search Log = false
+Write Debug Log = false
+Write Search Log = false
 Search Log Filename = SearchLog.txt
 Book File = book.bin
 Best Book Move = false
@@ -31,7 +32,7 @@ Cowardice = 100
 Min Split Depth = 4
 Max Threads per Split Point = 5
 Threads = 1
-Use Sleeping Threads = true
+Idle Threads Sleep = true
 Hash = 128
 Ponder = true
 OwnBook = false
@@ -41,5 +42,6 @@ Emergency Move Horizon = 40
 Emergency Base Time = 200
 Emergency Move Time = 70
 Minimum Thinking Time = 20
+Slow Mover = 100
 UCI_Chess960 = false
 UCI_AnalyseMode = false