Fix for bug 2630 (Build on Linux - Incorrect slash in #include)
- Change backslash to forward slash in sf_sys.cpp
f32_perf_test_H2.bat default set of tests for H2
f32_perf_test_H4.bat default set of tests for H4
f32_perf_test_H2_5000files.bat special set of tests for H2, uses 5000 files only (faster)
f32_perf_test_H4_5000files.bat special set of tests for H4, uses 5000 files only (faster)