bug 2864 [2/2]: move rss/* to misc/cronjobs/rss/*

bug 2864 [2/2]: move rss/* to misc/cronjobs/rss/*

As rss.pl is not a CGI script, moved it to join the
other cronjobs.  Full documentation of the script
is in misc/cronjobs/rss/rss.pl, but to summarize:

[1] rss.pl is run on the command line to produce
    an RSS XML document.  The output should be
    placed in a directory accessible to the OPAC
    (or staff) web interface so that users can download
    the RSS feed.  An example of usage:

    misc/cronjobs/rss.pl lastAcquired.conf

    Normally rss.pl should be run periodically (e.g., daily)
    to keep the feed up-to-date.

[2] The configuration file (e.g., lastAcquired.conf) lists

    * name of the template file to use
    * path of output file
    * SQL query

    rss.pl runs the SQL query, then feeds the output of the
    query through the template to produce the output file.

[3] The template file (e.g., lastAcquired.tmpl) uses
    HTML::Template syntax like any of the HTML
    templates for the web interface.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>