Some people forget to use the --follow-symlinks flag with sed(1),
thus not carrying changes over to /etc/apache2/sites-available.
This new command makes sure all vhosts in /etc/apache2/sites-enabled
are symlinks. It assumes that we always want to overwrite the file in
/etc/apache2/sites-available with the file in /etc/apache2/sites-enabled.
All uses of the VHOST_PATH variable in the code append a slash to
it, so it is easier to remove the trailing slash in it's instantiation.
Also simplifies the sed(1) invocation.
