fix search order for numpy includes
Merge pull request #135 from thorbenk/include_path_search_order

fix search order for numpy includes
-D_HDF5USEDLL_ is again needed
fixed localminmax docu
fixed warning for random seeding on 32bit systems
changed import_vigranumpy()
fixed VigranumpyConfig.cmake for Mac
made RF::predictLabels() thread-safe