Merge branch 'bsp_msvc_fix' into 'master'

BSP compile error workaround

Workaround for template argument deduction error in triangle bsp. 
msvc compiles if the default constructors of ref and ray are called.

See merge request !214

libs_required/ACG/Geometry/bsp/BSPImplT.hh

@@ -179,6 +179,8 @@ private: //---------------------------------------------------------------------
   /// Store ray collide information
   struct RayCollisionData
   {
+    RayCollisionData() : ref(), ray() {}
+
     Point   ref;
     Point   ray;
     RayCollision hit_handles;