increased fast timer history to 300 to make fast timers more usable

indra/llcommon/llfasttimer_class.h

@@ -66,7 +66,7 @@ class LL_COMMON_API LLFastTimer
 	public:
 		~NamedTimer();
 
-		enum { HISTORY_NUM = 60 };
+		enum { HISTORY_NUM = 300 };
 
 		const std::string& getName() const { return mName; }
 		NamedTimer* getParent() const { return mParent; }