Implemented untested UniqueOrderedIndex.
Introduced TypeGroupEdge/Vertex into database.
Added Index capabilityes to PropertyFamily.
Added method for adding index.
Added method for removing index.
DbAccessor:
-Guarantees that access to Vertex and Edge is possible only through
Vertex::Accessor and Edge::Accessor.
-Guarantees that changing Vertex and Edge is possible only using
Vertex::Accessor returned by vertex_insert() method and
Edge::Accessor returned by edge_insert() method.
-Offers CRUD for Vertex and Edge except iterating over all edges.
Squashed commit messages:
First step in database accessor refactoring done.
It's compiling.
All tests with exception of integration_querys pass
Tests now initialize logging facilities.
Refactored accessors.
RecordAccessor now has 3 states.
From,To,Out,In in there respecive Accessors return unfilled RecordAccessor.
Added iterator classes into utils/itearator/.
EdgeRecord now contains from,to fields as immutables.
Vertex in place of in vector of edges has in RbHashMultimap of edges.
Astar exepriment now uses real filters based on before mentioned map.
