upgrade to tcl/tk 8.6.8

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diff --git a/tcl8.6/doc/tell.n b/tcl8.6/doc/tell.n
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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH tell n 8.1 Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-tell \- Return current access position for an open channel
-.SH SYNOPSIS
-\fBtell \fIchannelId\fR
-.BE
-.SH DESCRIPTION
-.PP
-Returns an integer string giving the current access position in
-\fIchannelId\fR.  This value returned is a byte offset that can be passed to
-\fBseek\fR in order to set the channel to a particular position.  Note
-that this value is in terms of bytes, not characters like \fBread\fR.
-The value returned is -1 for channels that do not support
-seeking.
-.PP
-\fIChannelId\fR must be an identifier for an open channel such as a
-Tcl standard channel (\fBstdin\fR, \fBstdout\fR, or \fBstderr\fR),
-the return value from an invocation of \fBopen\fR or \fBsocket\fR, or
-the result of a channel creation command provided by a Tcl extension.
-.SH EXAMPLE
-.PP
-Read a line from a file channel only if it starts with \fBfoobar\fR:
-.PP
-.CS
-# Save the offset in case we need to undo the read...
-set offset [\fBtell\fR $chan]
-if {[read $chan 6] eq "foobar"} {
-    gets $chan line
-} else {
-    set line {}
-    # Undo the read...
-    seek $chan $offset
-}
-.CE
-.SH "SEE ALSO"
-file(n), open(n), close(n), gets(n), seek(n), Tcl_StandardChannels(3)
-.SH KEYWORDS
-access position, channel, seeking