2016-04-08: initial release
2016-08-22: removed index column
2018-08-03: code cleanup
2018-09-04: changes for CMK 1.5.x (inv_tree --> inv_tree_list)
2020-03-15: added support for CMK1.6x
2021-07-10: rewritten vor CMK 2.0
2021-07-15: added support for Catalyst 9800 Controllers
2023-06-07: moved gui files to ~/local/lib/chek_mk/gui/plugins/...
2023-06-14: removed declare_invtable_view from view definition on cmk 2.2 (see werk 15493)
            changed inventory_displayhints import (see werk 15493)