Implemented default translator for boost::tuple.
Added tests and docs.

svn path=; revision=81561
Each R*tree test divided into 2 files to decrease its size.
Added info about the Allocator in the docs.

svn path=/sandbox-branches/geometry/index_dev/doc/; revision=81565
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.

svn path=/sandbox-branches/geometry/index_dev/doc/; revision=81579
Small change in docs (text formatting).

svn path=/sandbox-branches/geometry/index_dev/doc/; revision=81581
knn reference added + small change in docs.

svn path=/sandbox-branches/geometry/index_dev/doc/; revision=81585
Added test for Value being boost::shared_ptr<obj<Indexable>>.

svn path=; revision=81739
fixed error in rtree's clear(), test added.

svn path=; revision=81775