Fixing output statements in CheckPoint.C

Merge branch 'icoe-developer' of github.com:geodynamics/sw4 into icoe…

…-developer

Reworked the forcing to make enforceIC more efficient

Merge pull request geodynamics#16 from tjesser-ucdavis-edu/subprocess…

…_module

Change os.system(...) to subprocess.run(...)

Final touches for v2.0

Updating the installation guide