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Fix a crash in of_closefork(), bug #551

Apparently dirlookup() might return NULL when trying to query the did
of an open fork:

    dir = dirlookup(ofork->of_vol, ofork->of_did);

Add a NULL check before using the result.
Don't print message "Ignoring ._file" for every ._ file, bug #552
Add a flag to load_volumes() that controls load behaviour
Run dbpath through variable substitution
Merge branch 'branch-netatalk-3-1'