Revert "Minor refactor.  Moved command argument to the top of GenerateBenchmark."
-This moved the usage of libdir above the initialiation of libdir.  I thought it wouldn't be a problem but it caused major issues .
This reverts commit db9390e7443988a22e0cd8eaa7b07aa34212d8b1.

Conflicts:
	GenerateBenchmark.scala