Request: Layer Numbers

[KenLucke]

Sorry, not familiar enough with github to be sure I'm posting this in the correct place, but:

You already optionally allow the adding of "_multi" to the filename. Please allow a further option to add the layer number(s) of the change(s) as well, something along the lines of:

filename_multi(212).gcode
or
filename_multi(212,274,390,416).gcode

This would enable the user to quickly scan the filename to see how soon an upcoming filament change is coming (especially if it's been a while since the file was last printed and you're an old fart who's afraid his memory might soon be faiing) and be prepared, instead of wandering off for a cup of coffee and a bagel :)