Suppressed hundreds of useless MSVC warnings (can be reenabled setting cmake variable ENABLE_NOISY_WARNINGS to ON). Fixed some of remaining warnings.

fixed kmeans center initialization in the case of huge matrices (ticket #1291); fixed warinings in libtiff.

* Fixed zlib search.
* Fixed compiler/linker flags caching bug.
* Fixed OpenCVConfig.cmake generation (currently tested only on Unix).

[~] fixed warning in featuers2d under windows (can't generate assignment operator)

updated 3rd party libs: CLapack 3.1.1.1 => 3.2.1, zlib 1.2.3 => 1.2.5, libpng 1.2.x => 1.4.3, libtiff 3.7.x => 3.9.4. fixed many 64-bit related VS2010 warnings