Add bbackupquery -W<level> option to set explicit warning level,

Obsolete old (inconsistent) meaning of -q in bbackupquery.

Replace -q with -Wwarning or -Werror in tests to reduce noise and fix 
tests.

Test that reading a nonexistent directory on the server doesn't crash 
server or client.

Test that bbackupd does continue backup run and delete files when 
storage limit is exceeded.

Use logging guards to hide expected warnings in testbbackupd.

Remove apparently pointless listing files on server at the end of 
testbbackupd.

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