Adjusted EPOCROOT handling so that in the context of Raptor invocation,
it also updates the environment variable so that other modules (such as
e32variant.pm) can also work without changes.
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)