make use of unicode files exported from MS Excel 2003

[Zhang Weiwu]

MS Excel 2003 can export utf16le text files from spreadsheets, so called "Unicode Text". This is the only usable format to exchange data to addressbook because:
1) it is unicode thus not need to guess local local and make mistakes of it;
2) it stores line-break within cell as \n while line-break between cells as \r. Thus can be processed easily by setting record separator to "\r";

[Zhang Weiwu (zhangweiwu)]

This is done but not documented yet.

But a side-effect is discovered, which is documented in news:2Mu1o.11076$<email address hidden>

In the end if we tolerate MS Excel 2003 Unicode Text format we will scarify compatibility with big-endian systems.