* markup addition, headings, shortcut for top level title (and author)
    :A~ @title @author (also available for level 2 (or 3) author) [version bump]

  * param markup identifier (and identifier) updated to identify markup
    addition in 0.57, :A~ @title

  * html search form in navigation band/banner and promo, adjustments,
    hyperestraier option offered in promo, requires change in sisurc.yml

  * sisurc.yml requires changes to make use search form options, [version
    bump] sample updated and commented out

* manifest
  * use relative link by default
  * in absence of configured url_root (http://) use info on location on local
    filesystem (file://)

* html outputs, navigation band/banner adjustment, in concordance and manifest

* html scroll, fix to document information link in table of contents

  * manifest make file-type descriptions simpler to understand

  * copyright restricted to rights tag, unless none, in which case rights tag
    gets creator information
  * copyright mark picked up in rights if 'Copyright (C)' is used

  * tex/pdf url matching semi-colon following url

  * endnote heading, apply tag to exclude numbering and segment heading where
    there is no segment

  * html scroll endnote text minor fix

  * initialize site structure, make copy site images default (sisu -CC)