Darrell Tangman authored Jun 17, 2013 and Andreas J. Guelzow committed Jun 17, 2013

 Update documentation for Manage Sheets, R1C1 notation, sheet ranges. 1.12 updates, typo corrections, misc. cleanup.

2013-06-17   Andreas J. Guelzow <aguelzow@pyrshep.ca>
	for Darrell Tangman <dgtangman@acm.org>

	* data-types.xml: Document R1C1 format cell references.
	  Describe sheet range references. Other minor updates.
	* gui-menus.xml: Updates for 1.12. Link to Manage Sheets dialog.
	* gui-toolbars.xml: Fix misdirected xref link.
	* quick-start.xml: Updates for 1.12. Other minor updates.
	* worksheets.xml: Document the Manage Sheets dialog.
	* figures/icon-locked.png: New
	* figures/icon-unlocked.png: New
	* figures/icon-visible.png: New
	* figures/worksheet-managing-dialog.png: New
	* figures/Makefile.am: Include the above.