Instead of creating the temporary file in a central location, place it
in the same directory as the configuration file. Pros:
* No need to rely on the "$TMPDIR" environment variable.
* Multiple users can upgrade their configuration files at the same time,
even if "$!" isn't set properly.
* One user can upgrade several configuration files (in different
directories or with different file names) at once.
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
f44b307e22