README: improve troubleshooting tips for unlocked encrypted files #300
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Rename the troubleshooting section "Can't log in with ssh even when user's encrypted home directory is unlocked" to the more general "Some processes can't access unlocked encrypted files", and rewrite it to provide clearer directions for how to fix the problem by upgrading encrypted directories to policy version 2.
Also add a related section "Users can access other users' unlocked encrypted files" which covers the reverse "issue", i.e. people expecting some processes to not be able to access unlocked encrypted files.
Fixes #248