Removed debug line added when testing for matrix memory leaks that messed up matrix.invert()

updated bvh import which was modified to account for that. as well as other minor changes.

source/blender/python/api2_2x/matrix.c

@@ -234,7 +234,6 @@ PyObject *Matrix_Invert(MatrixObject * self)
 	f = Matrix_Determinant(self);
 	det = (float)PyFloat_AS_DOUBLE(f); /*Increfs, so we need to decref*/
 	Py_DECREF(f);
-	det= 10.0;
 
 	if(det != 0) {
 		/*calculate the classical adjoint*/