XDG base directories and trash outside $HOME device

[Maurício Antunes]

> I'd actually prefer to take this chance to update the XDG basedir
> specification to mandate that $HOME and each of the $XDG_*_HOME
> variables are all on the same filesystem, with the XDG_* variables
> contained within $HOME.

Oh, I was so happy when I realized I could get rid of all those
directories that kept popping from time to time just by pointing all of
XDG_* to somewhere inside $(mktemp -d). Please don't take that from me!

Best,
Maurício