Loomis` Nested Set: Manage a tree of information stored in a database

This class can be used to manage a tree of information stored in a database.

It can perform several types of operations to manipulate an hierarchy of nodes that are stored in a database as table records.

Currently it can insert a root node, insert a node that is child of a given parent, delete a branch of nodes under a given node, delete a single node, rename a node, move nodes, check whether the root node exists and retrieve the whole tree of nodes.

Support of a Multi-Language Errorhandling.