Fixing issue #140

site-generator:

    Cosmetic adjustments. Additions to the POD documentation.
    Additions to module list.
    Additions to work better with UTF-8.
    Addition of functions 'parse_csv' and 'xml_entity'

templates/queries-episodes-sqlite.tpl.html:
templates/shared-utils.tpl.html:

    Cosmetic changes

templates/rss-query-hpr-mysql.tpl.xml:
templates/rss-query-hpr-sqlite.tpl.xml:
templates/rss-query-hpr_total-mysql.tpl.xml:
templates/rss-query-hpr_total-sqlite.tpl.xml:

    Enhancements to allow the query to collect the audio length from the
    'assets' table. The audio file extension is passed as an argument to
    the 'execute' statement.

templates/rss.tpl.xml:

    Cosmetic changes
    Changed one 'php' URL to 'html'.

templates/shared-episode-summary.tpl.html:

    Change to 'display_tags' macro to turn the 'eps.tags' field into
    a list of links. This works, but needs further development because
    using the tag strings as anchor ids is not reliable.

templates/shared-item.tpl.xml:

    Cosmetic changes.
    Addition of filter 'HTML.strip' which is used as a means of removing
    HTML tags from '<itunes:summary>' strings.
    Using new filter 'xml_entity' which converts all non-ASCII
    characters in the notes to numeric hexadecimal entities for
    '<itunes:summary>'.
    The '<enclosure>' tag now uses 'episode.length' rather than
    'episode.duration' which has been extracted from the 'assets' table.

@@ -206,0 +203,4 @@
+
+            if ($page_config->{'multipage'} && $page_config->{'multipage'} eq 'true') {
+                # Empty arrayref bug fixed, so count is reduced by 1
+                # was: if (scalar @{$parsed_arg{'ids'}} == 1) {