support outer() and linearSolve() for TinyVector
added automatic differentiation and levenbergMarquart()
added M_E constant
added documentation
added closeAtTolerance() for TinyVector arguments
added tests for DualVector (automatic differentiation)
added nonlinearLeastSquares() and test
added documentation for autodiff and nonlinearLeastSquares()
HDF5File: added convenience functions and tests
added multi-page TIFF support to exportVolume() and importVolume(), SIF support to importVolume()
allow 12 types in VIGRA_PYTHON_MULTITYPE_FUNCTOR()
vigranumpy: fixed writeVolume() and added multi-page TIFF support
improved documentation for importVolume() and exportVolume()
fixed gcc compatibility issue