Signed-off-by: Han Qiang <a0byte@gmail.com>

Allow to build samples via OpenCV binaries from distribution package
(find_package with OpenCV_DIR).

Added extra information for fitEllipse, minAreaRect and addapted ellipse &
ellipse2Poly parameter description.

We don't use -Wcast-align ourselves, but the headers trigger warnings
for those users who do, which is not nice.

added IPP optimization of separable 32f filters; fixed IPP version check in DFT; fixed conditions in IPP optimization of norm functions.

fixed building OpenCV with IPP 6.x (different DFT API); added Canny and rectangular morphology (based on Alex Kapustin patches)

Changed the brief description of function Mat::colRange from "Create a matrix header for the specified row span." to "Create a matrix header for the specified column span."

On a 32-bit compiler the calculation may result in data (size_t) overflow when running some paralleled algorithms (which can safely run on a 64-bit compiler).
This bug is found when running OpenCV's Retina tutorial on 32bit VS2010.

initialization time.

for libpng added.

Looks like we don't actually use them; when creating precompiled headers
with Visual C++, a dummy .cpp is created at build time.

ReST directive was used. Also fixed some other ReST directives that were
not correct and removed some warnings during buildbot checks.

disabled 64f IPP DFT; added IPP Gaussian filter; added IPP GetRectSubPix; added IPP BilateralFilter (temporarily disabled)

WITH_WINRT -> ENABLE_WINRT_MODE;
Some temporary char* replaced with Ptr<char>;
Build fix for regular WIN32;
Windows Platform SDK and MSVC search added to cmake;
Warinig fixes.

Additional CMAKE flag WITH_WINRT added.

- Used lunix style slashes - works on most systems
- Removed all trailing whitespaces