SPARQL-related modifications to Turtle formatting

replaced xsd:date with xsd:datetime for dates in turtle for platforms

removed unecessary bracket in turtle for instruments

replaced $r with $foo in dataset/prov.ttl.tut

changed caption to long-literal in turtle for tables

added long literals to turtle for datasets

added long literals to turtle for book

added tl helper to title in webpage

changed xsd:date to xsd:dateTime for access_date in webpage

removed gcis namespace from turtle for references

added space in file turtle to undirty working tree and permit push
SPARQL-related changes to turtle formatting