Fixed bug 3609346, renaming "dia" to "diagram-viewer". Updated embedded documentation.
	* *.tcl:         Bumped the version number to 5.8.
	* COPYRIGHT.txt:
	* README.txt:

	* scripts/*.tcl: Support for interactive cell editing with the aid of 
	  the ctext widget; added the "canceledediting" subcommand; sped up the
	  "selection" and "cellselection" subcommands by orders of magnitude;
	  significally reduced the performance penalty imposed by the
	  "-(select)background" and "-(select)foreground options at column,
	  row, and cell levels; improved the keyboard traversal during
	  interactive cell editing; using the "-data" option for most virtual
	  events; improvements related to the selection mode "extended"; 
	  further code improvements; eliminated a regression introduced in
	  Tablelist 5.6, related to vertical scrolling under Tk 8.5 or later in
	  the presence of embedded images or windows.

	* scripts/tclIndex: Newly generated.

	* ../../examples/*.tcl: Bumped the version number to 5.8.

	* CHANGES.txt: Updated to reflect the changes.

	* doc/*.html: Added a "Virtual Events" section to the reference manual;
	  updated to reflect the changes.
	* *.tcl:         Bumped the version number to 5.8.
	* COPYRIGHT.txt:
	* README.txt:
	* scripts/*.tcl: Support for interactive cell editing with the aid of
	  the ctext widget; added the "canceledediting" subcommand; sped up the
	  "selection" and "cellselection" subcommands by orders of magnitude;
	  significally reduced the performance penalty imposed by the
	  "-(select)background" and "-(select)foreground options at column,
	  row, and cell levels; improved the keyboard traversal during
	  interactive cell editing; using the "-data" option for most virtual
	  events; improvements related to the selection mode "extended";
	  further code improvements; eliminated a regression introduced in
	  Tablelist 5.6, related to vertical scrolling under Tk 8.5 or later in
	  the presence of embedded images or windows.
	* scripts/tclIndex: Newly generated.
	* CHANGES.txt: Updated to reflect the changes.
	* doc/*.html: Added a "Virtual Events" section to the reference manual;
	  updated to reflect the changes.
	* ../../examples/*.tcl: Bumped the version number to 5.8.
	* scripts/tablelistUtil.tcl: Minor optimization.
	* scripts/tablelistUtil.tcl: Minor optimization.
	* scripts/tablelistBind.tcl: Minor improvement.
	* scripts/tablelistBind.tcl: Minor improvement.
	* scripts/tablelistSort.tcl:   Using "-algn top" for the embedded
	* scripts/tablelistUtil.tcl:   message widgets displaying multiline
	* scripts/tablelistWidget.tcl: texts.
	* scripts/tablelistSort.tcl:   Using "-algn top" for the embedded
	* scripts/tablelistUtil.tcl:   message widgets displaying multiline
	* scripts/tablelistWidget.tcl: texts.
	* scripts/tablelistUtil.tcl: Small correction.
	* README.txt:               Slightly extended.
	* doc/tablelistWidget.html:

	* scripts/tablelistBind.tcl: Minor improvement.

	* scripts/tablelistUtil.tcl:   Worked around a peculiarity of Tk on
	* scripts/tablelistWidget.tcl: Windows, related to deleting an embedded
	  window while resizing a text widget interactively.
	* Small correction.
	* CHANGES.txt:               Slightly extended.
	* doc/tablelistWidget.html:
	* scripts/tablelistBind.tcl: Minor improvement.
	* scripts/tablelistUtil.tcl:   Worked around a peculiarity of Tk on
	* scripts/tablelistWidget.tcl: Windows, related to deleting an embedded
	  window while resizing a text widget interactively.