Added draw() and compute() methods to MEASURE class.
Added draw() and compute() methods to MEASURE class.

These methods encapsulate the two types of jobs that one can execute
during a MEASURE calculation: drawing a potential energy surface and
computing the k(T,P) values. The compute() method still looks very much
like it did before it was moved from the module-level execute() method
inside the MEASURE class.

comocheng/RMG-Py,enochd/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,faribas/RMG-Py,pierrelb/RMG-Py,comocheng/RMG-Py,faribas/RMG-Py,enochd/RMG-Py,KEHANG/RMG-Py,KEHANG/RMG-Py,chatelak/RMG-Py