make sure that the empty mat is copied to UMat properly - i.e. UMat becomes empty. Before the patch such copy operation crashed

1) fix include directories
2) don't use PCH for source file with custom COMPILE_FLAGS

  * add v_abs for universal intrinsic
  * add test of v_abs in test_intrin
  * fix compile error on gcc
  * fix bool OR operation

Templates are replaced by macro

fixed the difference of the calculation result for findStereoCorrespondenceBM_SSE2() and findStereoCorrespondenceBM_().