FEATURE: Kexi Table Designer is now able to track atomic changes performed
using KDE Undo/Redo framework; this will be reused to handle database
table altering without lossing data.

Table View
- small API and source code improvements (s/buf/set)

Table Designer
- fixed saving boolean types for table design
- Undo/Redo actions added and integrated with table altering

Internal
- "AlterTable" tab added to the "Kexi Internal Debugger" window

2.0: ported