upgrade to tcl/tk 8.6.8

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diff --git a/tcl8.6/doc/GetCwd.3 b/tcl8.6/doc/GetCwd.3
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-'\"
-'\" Copyright (c) 1998-1999 Scriptics Corporation
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH Tcl_GetCwd 3 8.1 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_GetCwd, Tcl_Chdir \- manipulate the current working directory
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-char *
-\fBTcl_GetCwd\fR(\fIinterp\fR, \fIbufferPtr\fR)
-.sp
-int
-\fBTcl_Chdir\fR(\fIpath\fR)
-.SH ARGUMENTS
-.AS Tcl_DString *bufferPtr in/out
-.AP Tcl_Interp *interp in
-Interpreter in which to report an error, if any.
-.AP Tcl_DString *bufferPtr in/out
-This dynamic string is used to store the current working directory.
-At the time of the call it should be uninitialized or free.  The
-caller must eventually call \fBTcl_DStringFree\fR to free up
-anything stored here.
-.AP char *path in
-File path in UTF\-8 format.
-.BE
-
-.SH DESCRIPTION
-.PP
-These procedures may be used to manipulate the current working
-directory for the application.  They provide C\-level access to
-the same functionality as the Tcl \fBpwd\fR command.
-.PP
-\fBTcl_GetCwd\fR returns a pointer to a string specifying the current
-directory, or NULL if the current directory could not be determined.
-If NULL is returned, an error message is left in the \fIinterp\fR's result.
-Storage for the result string is allocated in bufferPtr; the caller
-must call \fBTcl_DStringFree()\fR when the result is no longer needed.
-The format of the path is UTF\-8.
-.PP
-\fBTcl_Chdir\fR changes the applications current working directory to
-the value specified in \fIpath\fR.  The format of the passed in string
-must be UTF\-8.  The function returns -1 on error or 0 on success.
-
-.SH KEYWORDS
-pwd