incomplete units handling causes confusion

[jbfaden]

Right now, units are propagated through some operations. This caused confusion because one dataset in Cindy's script had units. In Cindy's case, if dimensionless and unit-ful data could be added (and I thought it could), the error wouldn't have caused a problem.

[jbfaden]

I wrote a new getDataSet command which allows for named parameters, like:

ds1= getDataSet('vap+cdaweb:ds=OMNI2_H0_MRG1HR&id=DST1800','Nov 2018',trim=True, units=None)

which will make it easier to avoid problems caused by units. This will be available as "getDataSet2024" until it is thoroughly verified.