Work on axis and grid:
* separate axis dimension and position
* load and save z axis, but don't show it
* remove compiler warnings in switch() and add FIXME instead for missing chart types
* introduce setUseAutomatic[Minor/Major]Interval() (not a feature - this was possible before, by setting the interval to 0)
* Relayout KDChart plane after switch between logarithmic and linear scaling
* split showGrid() up into showMajorGrid() and showMinorGrid()
* load axis style (code mistakenly was in the wrong place)
* load axis font from ODF

Axis scaling dialog:
* Get initial properties from axis