No option to set output location

[a-chernoff]

ETTrace/ETTrace/ETTraceRunner/RunnerHelper.swift

Lines 67 to 68 in 27d92ce

	let localFolder = Bundle.main.bundlePath
	let outFolder = "\(localFolder)/tmp/emerge-perf-analysis/Documents/emerge-output/"

In all cases the ETTraceRunner executable tries to write its output to this particular folder. Depending on the installation method, file system permissions, etc., this directory may not be writable.

1. It would be nice to have an option to set the output filename or at least output directory.
2. It might also make more sense to use the CWD as the default output directory, rather than the binary's install folder.