This class can be used to manipulate nested sets of database table records as an hierarchical tree.

It can initialize a tree, insert nodes in specific positions of the tree, retrieve node and it's parent records, change nodes position and delete nodes..

This source file is part of the SESMIK CMS.

##Methods:

• GetNode - Receive all data for node with number $nodeId.
• GetParent - Receive data of closest parent for node with number $nodeId.
• Insert - Add new child element to node with number $parentId.
• InsertNear - Add a new element into the tree near node with number $nodeId.
• MoveAll - Assigns another parent ($parentId) to a node ($nodeId) with all its children.
• ChangePosition - Change position of nodes. Nodes have to have same parent and same level of nesting.
• ChangePositionAll - Swapping nodes with it's children. Nodes have to have same parent and same level of nesting. $nodeId1 can be placed "before" or "after" $nodeId2.
• Delete - Deletes element with number $nodeId from the tree without deleting it's children. All it's children will move up one level.
• DeleteAll - Deletes element with number $nodeId from the tree and all it children.
• Full - Returns all elements of the tree sorted by "left".
• Branch - Returns all elements of a branch starting from an element with number $nodeId.
• Parents - Returns all parents of element with number $nodeId.
• Ajar - Returns a slightly opened tree from an element with number $nodeId.
• SortChildren - Sort children in a tree for $orderField in alphabetical order.
• MakeUlList - Makes UL/LI html from nested sets tree with links (if needed). UL id named as table_name + _tree.

• v4.4 - MakeUlList modified
• v4.3 - Added new method MakeUlList
• v4.2 - added fully functional demo samples
• v4.1 - added new method SortChildren

russian dicumentation http://www.sesmikcms.ru/pages/read/biblioteka-dlja-raboty-s-derevjami-nested-sets/

##Author Kuzma Feskov kfeskov@gmail.com ##Copyright © 2015, Kuzma Feskov