[PyQt] simplewidgetmapper.py, customsortfiltermodel.py, combowidgetmapper.py examples

[Hans-Peter Jansen]

Hi Phil, hi *,

attached are a few missing itemview examples for the collection.

While simplewidgetmapper.py and combowidgetmapper.py differ only in 
minor details, the customsortfiltermodel.py differs from the original 
in a major aspect: it actually works unlike the original ;-) 
 - the filters are applied on startup (UI shows consistent values)
 - the date limiter contain sane values
 - the date filter works properly

The last issue in MySortFilterProxyModel.dateInRange() results from a 
slight inconsistency in Qt: comparing QDate with QDateTime values 
doesn't work (at least not in a way, what would humans expect), hence 
the value has to be converted to a QDate before the comparison.

Enjoy,
Pete
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