Further debug work with quite some progress

Read the last line in *notes*.

Document *notes* added with some notes. Files *nonempty.tmpl*
and *arg-for-fripost.mdwn* are uppdated with more template variable
things.

In *pandoc.pm*:

 * Debug dumps from subroutine *pagetemplate* improved
 * Some extra meta things are tried out

1 files changed, 78 insertions, 0 deletions

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+<!-- -*- mode: markdown -*- -->
+
+Somwhere thers a transition pandoc meta -> general meta, for some meta
+
+# Pagestate data
+
+This is for *arg-for-fripost*
+
+* 002 1 early
+   * Meta according to wiki tags: title, titlesort
+   * No tags seen at all
+
+* 002 4 return
+   * most 'pandoc_*' available
+   * meta 'tag' and 'pandoc_tag' set according to pandoc meta
+   * meta 'abstract' and 'pandoc_abstract' empty
+   * meta 'num_author' is 2, 'author' content as string,
+     'pandoc_author' content as list
+
+* 007 1 early
+   * Meta overwritten according to wiki tags: title, titlesort
+   * Otherwise unchanged from 002 4
+
+* 007 4 return
+   * Back to 002 4
+
+* 013 1 early
+   * Back to 007 1
+
+* 013 4--027 4 continues
+
+# Working template variables
+
+The sytanx is e.g. `<TMPL_VAR TITLE>`. Compare template
+*nonempty.tmpl* with resulting HTML:
+
+ * TITLE -- pandoc meta
+ * DATE -- fallback to default `<TMPL_VAR DATE DEFAULT="1970-01-01">`
+ * TITLESORT -- nothing
+ * AUTHOR -- pandoc meta, 002 4, content as string
+ * ABSTRACT -- noting
+ * PANDOC_DATE -- pandoc meta
+ * PANDOC_PRIMARY_AUTHOR -- pandoc meta
+ * NUM_AUTHORS -- nothing
+ * TAG -- nothing
+ * PANDOC_TAG -- pandoc meta
+ * PANDOC_TITLESORT -- pandoc meta
+ * PANDOC_ABSTRACT -- nothing
+ * PANDOC_TITLE -- pandoc meta
+ * tags again with loop: ikiwiki meta
+
+tags again with loop:
+
+```
+<TMPL_IF TAGS>
+ |
+  <TMPL_LOOP TAGS>
+    <TMPL_VAR LINK>|
+  </TMPL_LOOP>
+      </TMPL_IF>
+<BR/>
+```
+# Page template data
+
+This is for *arg-for-fripost*
+
+ * identifies
+
+There is a need to also put things in subroutine *pagetemplate* to make
+them available as variables:
+
+```
+foreach my $k (keys %{$pagestate{$page}{meta}}) {
+    next unless $k =~ /^(pandoc_|fripost_)/;
+    $template->param($k => $pagestate{$page}{meta}{$k});
+}
+$template->param('date' => $pagestate{$page}{meta}{date});
+```