FIXES in 2.4.2-BETA-6

Fix from Derrick J. Brashear <shadow+@andrew.cmu.edu> concerning
ftpconversion problems when gzcating plain files.

Fix from Kazushi (Jam) Marukawa concerning missed changes to fnmatch in
access.c

Fix from Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl> concerning
closing file descriptors before exec in ftpd_popen (popen.c).
 
Config files for BSD 4.4-based OSes from Marc Baudoin <Marc.Baudoin@hsc.fr.net>
added.

Added some notes concerning skey support in the NOTES file.

Added some AIX patches from Bill Pemberton <wfp5p@tigger.itc.virginia.edu>.

Added virtual ftp server support from Brian Kramer <bjkramer@pluto.njcc.com>.