#14 special characters support in filename

[olivier gaeumann]

Somehow it seems that undo stack is not working when user is editing .wav file directly. It's no issue, because one need only to save it as .laoe to make everything work like expected.
However, if original filename had some non-latin chars, russian in my case, the resulting .laoe file won't open next time.
That's probably because it has XML utf-8 encoding format and some of the russian letters are not converted well to the XML entity.
Possible workaround is to edit XML directly and put CDATA tag, or, even simplier just replace filename entity for latin-only chars inplace (i.e. gunzip, fix the "name" in the < clip >, gzip back).

Hope it helps,
---
Max Shomeah