Updates for Community News tools

Community_News/make_email: minor tidying

Community_News/make_shownotes: addition of File::Copy; addition of cache
    management routines; cache is now managed here as well as in
    'make_email'; fixed a bug with use of '$/'; POD enhancements.

Community_News/recording_dates.dat: for reference

Community_News/shownote_template12.tpl: removed the "Updated on" section.

Community_News/shownotes_container.tpl: enhanced the datestamp header
    when generating "full" shownotes.

Community_News/shownotes_container.tpl

@@ -1,5 +1,6 @@
 [%# /home/cendjm/HPR/Community_News/shownotes_container.tpl 2024-06-22 -%]
 [%# Container to display Community News shownotes as an HTML page -%]
+[%- USE date -%]
 [% DEFAULT shownotes = ""
    episode = ""
    month_year = ""
@@ -52,7 +53,8 @@
       </h1>
     <h2>Your ideas, projects, opinions - podcasted.</h2>
     <h3>New episodes every weekday Monday through Friday.<br />
-    <em><small>Temporary version of the Community News notes for hosts to use when recording</small></em></h3>
+    <em><small>Temporary version of the Community News notes for hosts to use when recording<br />
+    Updated on [% date.format(date.now,'%Y-%m-%d %H:%M:%S') %]</small></em></h3>
 
   </div>
   <hr />