Hardcore characters don't share stash with others

Inspired by
http://opengameart.org/forumtopic/double-stash-softcore-and-hardcore
Delete stash on death, instead of working around old files in reset()

Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
Also delete stash on character deletion
Merge pull request #615 from stefanbeller/hcstash

Hardcore characters don't share stash with others