SPTK site is updated

[Alexey Parshin <alexeyp@sptk.net>]

Dear friend,

SPTK site is updated.

Added the preliminary support for Excel Unicode strings in Excel reader.
The conversion is done to the current locale. For Linux, this locale
should be set to non-Unicode locale using setlocale() prior to reading
an Excel file. For Windows it works even without it. It probably
wouldn't work on Solaris and other unix systems. This compatibility is
yet to be tested.

SPTK development team.