Log Message:
Update to 1.15. Provided by Kai-Uwe Eckhardt in private mail.

Changelog:
2013-02-01  Andreas Kupries  <andreas_kupries@users.sourceforge.net>

	*
	* Released and tagged Tcllib 1.15 ========================
	*

2013-01-28  Andreas Kupries  <andreask@activestate.com>

	* modules/fileutil: New package 'fileutil::decode'.
	* modules/zip: New module 'zip', with packages 'zipfile::encode'
	  and 'zipfile::decode'

2013-01-24  Andreas Kupries  <andreask@activestate.com>

	* New module and packages: clock (rfc2822, iso8601).
	  Tcl 8.5 only.

2013-01-08  Andreas Kupries  <andreas_kupries@users.sourceforge.net>

	* configure.in: [Bug 3593146]: Extended with CYGPATH usage to
	  allow building under cygwin.
	* configure: Regenerated (autoconf 2.67).

2012-08-07  Andreas Kupries  <andreask@activestate.com>

	* modules/generator: Generators (via the coroutines of
	  Tcl 8.6). Provided by Neil Madden.
	* support/installation/modules.tcl: