* macosx/tkMacOSXWm.c (WmAttributesCmd, WmIconbitmapCmd): add support

	* unix/tkUnixSend.c (Tk_GetUserInactiveTime):             for weakly
	importing symbols not available on OSX 10.2 or 10.3, enables binaires
	built on later OSX versions to run on earlier ones.
	* macosx/Wish.xcodeproj/project.pbxproj: enable weak-linking; turn on
	                                         extra warnings.
	* macosx/README: document how to enable weak-linking; cleanup.
	* unix/configure.in: add check on Darwin-X11 for ld support of -weak-l
	* unix/tcl.m4:       flag and weak-link libXss if possible as it is not
	available before OSX 10.4; enforce requirement of OSX 10.2 for TkAqua;
	move Darwin specific checks & defines that are only relevant to the tcl
	build out of tcl.m4; restrict framework option to Darwin; cleanup
	quoting and help messages.
	* unix/configure: autoconf-2.59
	* unix/tkConfig.h.in: autoheader-2.59

	* macosx/GNUmakefile: enable xft for TkX11 build.
	* macosx/tkMacOSXFont.c (TkMacOSXQuarzStartDraw, TkMacOSXQuarzEndDraw):
	verify validity of context returned from QDBeginCGContext() before use.
	* macosx/tkMacOSXKeyEvent.c: ifdef out diagnostic messages to stderr.

	* macosx/tkMacOSXEvent.h:      standardize MAC_OS_X_VERSION_MAX_ALLOWED
	* macosx/tkMacOSXMenu.c:       checks per QA1316, ensure define can be
	* macosx/tkMacOSXMenubutton.c: overriden on command line (from default
	* macosx/tkMacOSXMenus.c:      of current OS version).
	* macosx/tkMacOSXMouseEvent.c:
	* macosx/tkMacOSXWm.c:

	* macosx/tkMacOSXFont.c (TkpMeasureCharsInContext): fix
	signed-with-unsigned comparison and other warnings from gcc4 -Wextra.

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