Generalize to other dev environments

1) added a few missing dependencies to the setup.py
2) replaced hardcoded SOURCE_DIR and TMP_DIR with env vars TSQA_SRC_DIR and TSQA_TMP_DIR
3) commented out the "# TODO: remove, this is a hack for local dev" block in Environment
4) changed Layout.suffixes.bindir from 'usr/bin' to 'bin'.
5) added Layout.suffixes.libdir to LD_LIBRARY_PATH
6) deleted the checked in tmp dir