Vacation plugin v1.42

This plugin is totally based on Jonathan B. Bayer <jbayer@spamcop.net> 
and Matt King's <sqmvac@magnetinternet.com> vacation plugins.

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BACKGROUND
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Jonathan based his vacation plugin (I think) on Matt's vacation plugin.  The
difference between the two is that Jonathans used a local program to set 
vacation and .forward file while Matth's used PHP's ftp built in functions.
Everything was cool until Jonathan stop supporting his plugin and it stopped
working around Squirrelmail 1.2.8?  I tried to port it to 1.4 but it was 
a pain so I just took the one that Matt maintains and rewrote the plugin 
similarly to Jonathan's.  I also made many modifications to his ftpfile 
program since he assumed root had access to all users files and that is not 
the case in an NFS exported file system before changing root's uid.

Requirements
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* The configuration files need to reside in the top level of the
  users' home directories.
* The Vacation program needs to be installed. For most sendmail configurations
  it also means you need to put a symbolic link in /etc/smrsh to the vacation
  program. The RPM for RedHat can be found here:
  ftp://ftp.redhat.com/pub/contrib/libc6/i386/vacation-1.2.2-2.i386.rpm

You should edit (at least) the config.php file to reflect the settings at your
site. All the text can be edited there.

Author
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Isaac Saldana <isaacsys@ee.ucr.edu>