Generalized article set manipulation
	Interface to subject listing.
	Recursive newsgroup visitation.
Virtual article abstract type to allow the following:
	Personalized header munging via % subs.
	Undigestification.
	Personal archive perusal.
	Mail handling.
Parent command (waiting for ARTFILE interface and recursive newsgroups).
Merge Pnews and postnews or possibly make Pnews into a C program.
Replace Rnmail to a direct interface to popular mail user agents.
Vnews duplicate suppression algorithm for sites that can't do Xref patch.
Need to pull parallel arrays into array of structs.
Separation of .newsrc functions and newsgroup functions to separate processes
	communicating via pipes (to make fit on non-separate-I-and-D pdp11,
	or unreasonable facsimiles thereof).
.newsrc management for a variety of NNTP servers.
Add xrn feature to continue to retry when NNTP server is unavailable.
Make it possible to "refresh" the local active file to catch any new 
articles that may have come in via NNTP.
Faster!!!
Smaller!!!
More general!!!
Perfect?