newsrc.icn: Program to organize UNIX .newsrc file

This program takes the .newsrc file, moves active groups to the beginning
then appends inactive groups with the numbers omitted, then anything else.
the groups are alphabetized.

The user may retain a set of groups at the top of the file by specifying how
many groups on the command line. If not specified, it will be prompted for.
the new file is called newnewsrc. The user can replace .newsrc with it if it
is satisfactory.