This patch adds calls to Tcl_ExternalToUtf and Tcl_UtfToExternal
functions on parameters of SPI functions.
Without this calls it's imposiible to work with 8-bit text in pl/tcl
functions with tcl-8.3.
Patch assumes that database encoding and system encoding of Tcl is
equal.
Patch is agains current CVS sources. It adds new configure switch
--enable-pltcl-utf. Without this switch patch does nothing.
