Configure Calendar submenu doesn't escape inputs well

[Joshua Blanton]

The Configure Calendar cascade submenu generation doesn't escape its input well for the calendar title (or filename, if there is no title set). This results in a crash if, for instance, you try to include a calendar with a '.' in its filename and no title.

Attached is a patch that cleans up the case by following the idea laid out in tcllib/menus.tcl - basically, generate a unique index for each menu item that's unrelated to the filename, and use that as the reference to the menu item. I tested it on some simple cases, and it seems to work correctly - but I must admit that my TCL is rusty.

[Sergei Golubchik (sergii)]

fixed. thanks!