Fix links for TNEF attachements with umlauts.
This patch fixes the generated file links for files in TNEF attachments containing non-ascii-charcters. With this patch, the same file naming scheme is applied as used in KNefParser::extractAttachementTo(...) which first uses att->fileName() and att->file() only as a fallback. The patch contains fixes for all code snippets in KDEPIM using KTNEFParser::extractFileTo(...). REVIEW: 121937
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