reduce avatar verticle jump from the absurd 5 meter jump to a less

absurd 3m vertical jump to better match what you would see in Second
Life and be more in line with what users would expect.

OpenSim/Region/Framework/Scenes/ScenePresence.cs

@@ -2293,7 +2293,7 @@ namespace OpenSim.Region.Framework.Scenes
                 {
                     if (direc.Z > 2.0f)
                     {
-                        direc.Z *= 3.0f;
+                        direc.Z *= 2.5f;
 
                         // TODO: PreJump and jump happen too quickly.  Many times prejump gets ignored.
                         Animator.TrySetMovementAnimation("PREJUMP");