[bug #2536] (thuban) add unicode support

[Request Tracker]

this bug's URL: http://intevation.de/rt/webrt?serial_num=2536
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Subject: add unicode support

Thuban should be able to handle unicode.

Todo: Convert all text strings that enter thuban to unicode objects.  Use
unicode objects for all text inside thuban.  Use a wx version with unicode
support.



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