#3 buggy colspan parmeter in gridlayout

[Nils Einecke]

The parameter colspan, used when adding an element to a
gridlayout, is buggy.

For example:
qt .top.layout add .top.element row 0 column 0 colspan 2

This spans the element other 3 columns, i.e. adding an
element with colspan S will span the element over S+1
columns.