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Tests and repairs for stg log

Add t0009-log.sh to test `stg log`.

Use `tformat` instead of `format` in default output format. There is no
trailing newline when regular `format`, while `tformat` ensures a
terminating newline.

Check for invalid option and argument combination before performing any
actions. New checks ensure that --clear is used by itself.

Signed-off-by: Peter Grayson <pete@jpgrayson.net>

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