Kexi is now able to display multiple values within the same combo box editor, e.g. name + surname

Table Designer
- fixed altering table schema when lookup column has been changed
- added support for multiple visible columns in the combo box editor (the same for forms)
- on altering table, remove old lookup field schema objects; make sure you do not save empty type/name fields to XML
- fixed updating "lookup column" tab's contents
- fixed crash on saving design with lookup columns defined

Query Designer
- fixed crash if column being removed has sorting set up

2.0: merged