Named FastFeatureDetector::Type to allow its use in makePtr.

It has actually worked before (likely because it's inside a class),
but C++03 does disallow unnamed types as template arguments,
and there's a report that at least in one version of GCC it's
enforced: <http://code.opencv.org/issues/3278>.
Add optional NEON intrinsics to core/src/arithm.cpp
refactored modules/core/src/arithm.cpp
do requested fixups, broke sse2 vectorization
Finish sse2 refactoring
Modify functors for sse2
Merge vBinOp8 with vBinOp16, vBinOp32s with vBinOp32f