disabled the use of SSE4 instructions as well to make the code compatible with the old Intel and AMD chips

added test for the old cvHaarDetectObjects. disabled AVX optimization in haar.cpp. it should cover tickets #2534, #2591, #2669

Use min/max bounds instead of local value to calculate acceptance threshold.
Threshold based on local values somethimes does not work because cancellation
of big values may produce error bigger than local value.

Added test checking that all valid fourcc values are converted properly