* reselect callbacks
* remark: Only working in some cases as sorting is part of the model, while selection is part of the view (and sorting can take place without the view knowing the model is sorted)
* allow to sort by property index
* renamed to m_sortColumn
* invalid models can be highlighted on stash
* selection mode can be toggled between single/multi selection (where applicable)
* color for highlighting can be set
* finetuning of menus
* added required signal slots
* moved models for stashing into aircraft model view
* allow to unselect when stashed
* fixed DB object highlighting and resize row height automatically
