Removed forks

refs #2680
Added a cache for the forwad hash

refs #2680
TreeBuilder: Changed MainOverLink inheritance

refs #2680
TreeBuilder: fixed MainOverLink forward hash

refs #2680
TreeBuilder: removed duplicated foreach

refs #2680
TreeBuilder: Fixed handling of objects below of host objects

refs #2680
TreeBuilder: Fixed additive inheritance for MainOverLink

refs #2680
TreeBuilder: prepend inherited attributes

refs #2680