Rework the Ontology documentation

This change was motivated by https://gitlab.gnome.org/GNOME/tracker/issues/104.
We want to move to using URLs that we control for the ontologies, like
this:

        http://api.gnome.org/ontologies/nfo/3.0/#Document
        http://api.gnome.org/ontologies/nfo/3.0/#url

For this scheme to work, each ontology needs to document all classes
and properties on a single page.

It's an opportunity to reorganize the documentation too and try to
prioritize the most important info. Here's a partial list of
changes in this commit:

  * One page per ontology, listing all classes and properties defined
    in that ontology.
  * URL fragments matching class and property names, so for example
    /nmm.html#artistName links to the nmm:artistName property.
  * Cross references now work between libtracker-sparql3 and
    tracker3-nepomuk ontology docs
  * Properties are shown as a concise table.
  * Classes and properties are listed in alphabetical order.
  * New 'tracker:classSpecification' and 'tracker:propertySpecification'
    properties which allow us to link to upstream documentation.
  * New 'synopsis' section for each ontology showing appropriate Turtle
    @prefix statement

Also, the `docs/tools/ttl2xml` program now returns failed status
when it encounters parse errors in an ontology.

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