Website updates (mostly cosmetic)
Handle conf:loadRDF from local file better
Fix broken Unicode char in path page titles
Make inverse blank node links work again
Support for vocabulary labels

* Vocabularies are loaded from any URL specified as conf:loadVocabularyFromURL
* Labels are shown in HTML pages for classes and properties
Various fixes to label display from vocabularies

* Add documentation
* Show labels by default
* Fall back to previous behaviour if no label found
* Make it work for blank nodes too
Show labels for all resources if present in data
Manage property order via conf:weight
Don't use auto-generated labels for property values
Consistently use title case where appropriate