Remove weirdo unicode – and just use a normal -(cherry picked from commit 0d49de51)

initial optical flow was not cleaned during the second call

The generated OpenCV Java source can contain characters outside of ASCII on some systems – this patch allows the ant task to compile them.
(cherry picked from commit f3ee55e0)

* disabled warnings from thrust
* fixed warnings from ts_gtest.h
* possibly fixed superres compilation in Debug mode on Windows

Currently the function only supports wavefront size query

add hack to disable optimization of linear svms; improved precision of optimize_linear_svm; add the relevant test, which however requires some big database (so it's disabled by default)

1. Added more sync to reduction.
2. Turned off Image2D feature. Probably its support is not detected correctly.
3. Temporary disabled descriptor tests - can't localize a problem of the ocl descriptor.