want better interface to lispusers (and library) package organization

[masinter]

I think the "clean up lispusers" could (should?) happen without moving files to sub-directories. Then (or in parallel) we could do a design (and implementation) for changing FINDFILE and related functions so that they all work together, "properly", in the presence of sub-directories. Or, we could think about what problem(s) with the lispusers packages we were trying to solve in the first place... not knowing what files were part of a package, not knowing the dependency relationships between files and not knowing whether they are utilities shared between packages, etc. Some of that might just be updating the FILESLOAD coms, some might be updating the documentation.

Originally posted by @nbriggs in https://github.com/Interlisp/medley/issues/700#issuecomment-1051117238