[PyQt] More itemview examples and fixes

[Hans-Peter Jansen]

Hi Phil,

here's a bunch of new itemview example code:

	frozencolumn, interview and storageview

and some fixes:

 * combowidgetmapper.py gains python3 compatibility
 * dirview.py is a rewrite, syncing with upstream
 * editabletreemodel.py is from the nit picking department

All scripts are tested with Python 2 and 3.

Cheers,
Pete
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