upgrade to tcl/tk 8.6.8

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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1997 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 global n "" Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-global \- Access global variables
-.SH SYNOPSIS
-\fBglobal \fR?\fIvarname ...\fR?
-.BE
-.SH DESCRIPTION
-.PP
-This command has no effect unless executed in the context of a proc body.
-If the \fBglobal\fR command is executed in the context of a proc body, it
-creates local variables linked to the corresponding global variables (though
-these linked variables, like those created by \fBupvar\fR, are not included
-in the list returned by \fBinfo locals\fR).
-.PP
-If \fIvarname\fR contains namespace qualifiers, the local variable's name is
-the unqualified name of the global variable, as determined by the
-\fBnamespace tail\fR command.
-.PP
-\fIvarname\fR is always treated as the name of a variable, not an
-array element.  An error is returned if the name looks like an array element,
-such as \fBa(b)\fR.
-.SH EXAMPLES
-.PP
-This procedure sets the namespace variable \fI::a::x\fR
-.PP
-.CS
-proc reset {} {
-    \fBglobal\fR a::x
-    set x 0
-}
-.CE
-.PP
-This procedure accumulates the strings passed to it in a global
-buffer, separated by newlines.  It is useful for situations when you
-want to build a message piece-by-piece (as if with \fBputs\fR) but
-send that full message in a single piece (e.g. over a connection
-opened with \fBsocket\fR or as part of a counted HTTP response).
-.PP
-.CS
-proc accum {string} {
-    \fBglobal\fR accumulator
-    append accumulator $string \en
-}
-.CE
-.SH "SEE ALSO"
-namespace(n), upvar(n), variable(n)
-.SH KEYWORDS
-global, namespace, procedure, variable