Use find_program() to set CMAKE_C_COMPILER and CMAKE_CXX_COMPILER.

Originally the variables was set to compiler name, without absolute path.
CMake 3.0 tries to find them in CMAKE_FIND_ROOT_PATH (since 
CMAKE_FIND_ROOT_PATH_MODE_PROGRAM was set to ONLY) and fails.

fixes for latest changes in opencv3.0 api

waitKey() normalization

fixed mser bindings

Signed-off-by: Yan Wang <yan.wang@linux.intel.com>

The 'sysctl' syscall has been strongly deprecated on Linux for ages.
Currently, on old architectures it will spam syslog whenever used, and on
newer ones it's missing from the headers altogether.  Opencv has migrated
away on Linux already, but #includes were left lingering.  This commit
removes them on non-__APPLE__, unbreaking x32 (and probably others).

it is marked as obsolete

Signed-off-by: Yan Wang <yan.wang@linux.intel.com>

I had to make this modification locally to get opencv to build with python 2.6.  Python 2.6 requires indices in the format string (the `0` I added).  This requirement was relaxed in 2.7, so what used to be there would be working for people who could upgrade. I don't think the change has any negative consequences for future python versions, but I'm no expert.

- added test for loading legacy files
- added version to new written models
- fixed loading of several fields in some models
- added generation of new fields from old data