Add ability to use alternative refSeq display names (e.g. choice of default alias used)

[cmdcolin]

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This would allow using unmodified NCBI FASTA files for example, which have coded identifiers that are inscrutible

Another use case it is could allow people with a fasta file that says "chr1" to choose for it to just say "1" (maybe that is a code snippet that renames on the fly, or something like that. or it could come from a data file. we have mostly not done the route of running code snippets for refnames so far so not sure)