Document support for the new -s and -R command-line options, and the 'N' flag.  These were coded in March as revisions 1.55 and 1.56 of newsyslog.c.  I intend to MFC all the matching changes next week. This also reorganizes the description of the 'flags' field to give list of the valid flags, instead of a long paragraph explaining each of the possible values.
Document support for the new -s and -R command-line options, and
the 'N' flag.  These were coded in March as revisions 1.55 and 1.56
of newsyslog.c.  I intend to MFC all the matching changes next week.
This also reorganizes the description of the 'flags' field to give
list of the valid flags, instead of a long paragraph explaining
each of the possible values.

Obtained from:	NetBSD (in spirit at least, for -s and N)
MFC after:	1 week

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