Fixing 'absolute_url'

site-generator:

    Added all the modules that the script and the templates use to make
    it explicit what is required.

templates/shared-utils.tpl.html:

    Added a new TT² macro called 'absolute_url' which takes two
    arguments, the base and  the path or relative URL. It's fairly
    primitive but seems to work.

templates/content-about.tpl.html,
templates/content-recording.tpl.html,
templates/content-request_a_slot.tpl.html,
templates/content-requested_topics.tpl.html,
templates/page.tpl.html:

    All calls to 'absolute_url' changed to use two arguments, and the
    link definitions adjusted to match this change.

site-generator

@@ -116,8 +116,15 @@ use Pod::Usage;
 use Config::Std;
 use Text::CSV_XS;
 use HTML::Entities qw(encode_entities_numeric);
+use Date::Calc;
+use DBI;
+use DBD::SQLite;
+use Tie::DBI;
 use Template;
+use Template::Plugin::Date;
+use Template::Plugin::DBI;
 use Template::Plugin::HTML::Strip;
+
 use Data::Dumper;
 
 exit main();