Page format is trivial: it is arbitrary formatted plaintext.
It will be rendered in HTML through the <pre> tag.
The only specific inline formatting construction is [LINKS].
It may be followed by "#name" to create an anchored link.

But there are also special "command" lines, ending with "\r\n"
instead of ordinary "\n". Here are possible commands, playing
role only (currently) during HTML generation.

* => URL[ optional text]
  Creates <a href="URL">{optional text|URL}</a> link in HTML.

* img URL[ optional text][ => URL-A]
  Creates <img src="URL" [alt="optional text"] /> in HTML.
  If "=> URL" is specified, then <a href="URL-A"><img ... /></a>.

* |...
  Just inserts raw ... line to HTML output as-is.

* #...
  Does nothing, commented line.

* <<[indent][page]
  Include contents of the specified page. indent is optional.
  Brackets around [page] are for making a link to page.

* do-backs
  Forcefully creates a table with all backlinks to the page.

* A name
  Creates an invisible anchor with the specified name.

* A [page] name
  Also creates an anchor, but also links resulting page+anchor to the
  specified page. It may be useful for creating index-pages.