I tried to find a "setgap" or a "gap" command to set manually the gap value, and surprisingly it doesn't seem to exist. Maybe I'm wrong.
Anyway, It would be nice to have such a command, especially if we can also set a negative value this way. I would like to use negative values to make tile rows: they need to be imbricated one into the other.
Edit : I don't know how I managed, but the "gap" command does exist and accepts negative values. So a thread for nothing, sorry.
