Ensure proper file permissions on unix

[jsparber]

The database shouldn't be world readable.

[vi]

Shouldn't this be decided by umask by default?

If user does not want to have information world-readable by default, just set umask 077 and files will be created non-world-readable by default.

[spacejam]

I agree with @vi - this is a concern that should be handled at the umask level