nearest and query visitors renamed.
some of warnings fixed.
Fixed nullptr dereference errors.
Added rtree::swap() method.
Added requirement 'Nonthrowing copy constructor of the Translator'.
Pointers and Iterators types removed from the default Translator.
Modified glut_vis additional test and added generated rtree images.
Rtree docs and sample modified.

Rtree introduction expanded.
Quickstart improved.
not_xxx() predicates generators removed.
disjoint test added.
Added constructor, insert() and remove() taking a Range.
Added construction, insertion and removal tests for all versions of methods and functions.
Docs updated.
Implemented default translator for boost::tuple.
Added tests and docs.
Inserter included in the rtree.hpp
Added docs regarding inserter and creation of the rtree from the query results.
Added info about comparision of tuples in default translator.
Added test for Value being boost::shared_ptr<obj<Indexable>>.
fixed error in rtree's clear(), test added.