rebase TIP [http://tip.tcl.tk/414|#414] implementation

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diff --git a/doc/InitSubSyst.3 b/doc/InitSubSyst.3
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+'\"
+'\" Copyright (c) 2013 Tcl Core Team
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\" 
+.so man.macros
+.TH Tcl_InitSubsystems 3 8.6.1 Tcl "Tcl Library Procedures"
+.BS
+.SH NAME
+Tcl_InitSubsystems \- initialize the Tcl library.
+.SH SYNOPSIS
+.nf
+\fB#include <tcl.h>\fR
+.sp
+const char *
+\fBTcl_InitSubsystems\fR(\fIpanicProc\fR)
+.SH ARGUMENTS
+.SH ARGUMENTS
+.AS Tcl_PanicProc *panicProc
+.AP Tcl_PanicProc *panicProc in
+Desired panic function, for error reporting. If NULL, the default
+panicProc is used, which normally writes the message to stderr.
+.BE
+
+.SH DESCRIPTION
+.PP
+The \fBTcl_InitSubsystems\fR procedure initializes the Tcl
+library. This procedure is typically invoked as the very
+first thing in the application's main program.
+.PP
+\fBTcl_InitSubsystems\fR is very similar in use to
+\fBTcl_FindExecutable\fR. It can be used when Tcl is
+used as utility library, no other encodings than utf8,
+iso8859-1 or unicode are used, and no interest exists in the
+value of \fBinfo nameofexecutable\fR. The system encoding will not
+be extracted from the environment, but falls back to iso8859-1.
+.PP
+The return value is the Tcl version.
+.SH KEYWORDS
+binary, executable file