[latexrefman] Added a section on xr

Hefferon, Jim S. jhefferon at smcvt.edu
Tue May 25 20:11:49 CEST 2021

I added a section on xr.  It includes an example of needing a prefix for the labels and also a note about hyperref.

The base packages seem to me to be pretty much core behavior, so documenting them seems sensible.  I'm not going to do alltt, but a couple of them seemed easy and sensible.


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