Add more extensive documentation strings for many functions

[jafingerhut]

[jafingerhut]

Some suggested alternate doc strings for many Loom and Ubergraph functions. A fair amount of it is likely specific to the Ubergraph implementations. I have not checked for differences with the implementations on Loom graphs.

[Engelberg]

This all looks great. Thanks for the contribution. I don't want to push a release while I'm traveling and won't be readily available to support any issues caused by a new release, but will definitely include this with next release.