Update installation

[nuclearkatie]

• Trailmap uses cyclus discover_metadata_in_cyclus_path(), which throws a RuntimeError that GrowthRegion (part of Cycamore) requires Cyclus to be compiled with COIN. How to do this should probably in the Trailmap install docs, since this is guaranteed to come up even though GrowthRegion may not actually be used. Basically, both Cyclus and Cycamore need to be installed with --allow-mips, and also --clean-build if they have previously been built without COIN
• Should mention that trailmap may need to be added to your PYTHONPATH