hybrid approach for looking up standard name

[aradhakrishnanGFDL]

Running --slow on SPEAR, it does take a while and takes away the main advantage of using the builder in a quick preview mode. Though its super useful, we need to be prepared to find alternatives and make it more efficient

• We need an approach where we check for the fast option first, and then go to the slow option if there is no standard name in the lookup table.

• Explore others way to get standard or long names for non standard variables

• We also need to use the dmget python utility I have here if we are opening files, and also make the dmgets efficient - as in dmget them all at once.

@Ciheim please work with @ceblanton as one of these issues may be in the purview of the workflow