Revert "fldb: Change JSON output to array"

This reverts commit 1e0db1e51c5c77128f961e897187418a64172671. I'll
probably add some more metadata to the output, and need to separate that
from the file information. Also had to update the two tests added in
e1351cd ("fldb: Read file list from stdin if '-' is used with
--files-from", 2013-04-30 12:58:52 +0200).

Conflicts:
	src/fldb/tests/fldb.t

de0857e0-b673-11e2-8681-0016d364066c
fldb: Use indents in JSON output

The '"files":[' line should be on its own line, and without indents it
looked weird. This is better, even though there's four more characters
in every line now. Hm, maybe I should create a -m/--minimal option.
We'll see.

327e36da-b68a-11e2-baa1-0016d364066c