tmpdir: more cross platform solution, and .txt file ending
darwin: allow for gnu mktemp in path
edit: bsd mktemp needs nothing after the Xs
Bump version.
Use APG instead of pwgen for password generation

APG offers a nice "pronounceable" password generation option, and I'd like to
use it with password-store.
tests: fix t0010 with APG
tests: fix t0500 with APG

APG can't generate passwords longer than 255 characters.