Patch, WaitCursor during factorial

[eike lange]

Hi!

As reported in Bug 139397, kcalc takes long time to calculate the
factorial of a big number. If numbers are big enough, kcalc freezes. 
IMHO, the user needs some visual feedback. 

The patch attached to this mail adds a WaitCursor during this long
operation, which does not disturb too much, if the operation is in fact
short. 

I could add a MessageDialog, which warns the user, if the input is
larger than maybe 1,000,000 (configurable) or just add a ToolTip to the
factorial button which shows, that this op may take long time. 

Eike

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