Quartus tools submenu has been added to MainDesignMenu. Tcl shell
invocation works but causes an error during launch. This is Quartus
issue as the same error appears when the shell is started from
conventional Linux console.

modified include to search from the project root (as iverilog does) in addition to relative to the source file directory

one of the editor windows instead of the file if it is open (possibly
dirty)

mark it as an error