- Changed earthquake code to not add all the intensities but use the maximum

in DEarthQuake::StaticGetQuakeIntensity. The reason for this: Quakes were
  never supposed to be additive. Many maps, including Hexen's own have placed
  quake spots so that they cover a larger area but the areas covered by the
  single spots overlap. On such maps the view will shake like crazy and
  render the map nearly unplayable.


SVN r480 (trunk)

src/g_shared/a_quake.cpp

@@ -139,7 +139,8 @@ int DEarthquake::StaticGetQuakeIntensity (AActor *victim)
 				victim->y - quake->m_Spot->y);
 			if (dist < quake->m_TremorRadius)
 			{
-				intensity += quake->m_Intensity;
+				if (intensity < quake->m_Intensity)
+					intensity = quake->m_Intensity;
 			}
 		}
 	}