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.
