donutdb cli should allow you to specify the path to download a database

[HSchmale16]

I've been having some issues with downloading the databases from dynamodb after making changes to them. The donutdb cli command wants you to specify a database name and will try to write to that path even if it is in root. The cli pull command should include 1 more optional argument as a path to write the database to. The vfs setup requires an absolute path it seems.

It also by default marks any database file as executable. So the file permissions for anything written out should be 0644 instead of -rwxr-xr-x.