added IPP dot product functions. Only 32f data type supported for now (there are accuracy issues in 8u/16s/16u/32s functions which will be fixed in IPP 7.0.3)

temporarily disabled compute descriptor kernel for new cards (some problems with threads synchronization), old version of kernels is used.

adding cap_images.cpp to android build, may fix link error, but not really address issue of reading video files on android

*fixed some warnings
*finished gpu test port to gtest framework

replaced alloca() (a.k.a. cvStackAlloc) with AutoBuffer or vector() everywhere. cvStackAlloc() is still defined, but we do not need alloca() anymore to compile and run OpenCV (fixes #889 and may be some others)

replaced alloca() (a.k.a. cvStackAlloc) with AutoBuffer or vector() everywhere. cvStackAlloc() is still defined, but we do not need alloca() anymore to compile and run OpenCV (fixes #889 and may be some others)

replaced alloca() (a.k.a. cvStackAlloc) with AutoBuffer or vector() everywhere. cvStackAlloc() is still defined, but we do not need alloca() anymore to compile and run OpenCV (fixes #889 and may be some others)

removed CMakeLists.txt from gpu/test folder to avoid precompiled header associated warnings under Ubuntu