Moved apd cache to ${HOME}/.cache/apd
Following the problems described in #12 (closed) and #13 (closed) we could move to a per user temp dir or directly keep it in the home directory. I put it in the home dir as it's more useful I think, but that means we need to review the lifetime of the entries.
Closes #12 (closed) #13 (closed)
Edited by Ben Couturier