regex import fixes
fixed calculate_R when no production_ratios
Merge remote-tracking branch 'origin/release/release-2.0.0' into release/release-2.0.0
Merge branch 'release/release-2.0.0' into develop

Conflicts:
	pychron/lasers/points/points_programmer.py
	pychron/lasers/stage_managers/stage_manager.py
	pychron/processing/argon_calculations.py