Remove Butt option in ST_RingBuffer
Add unit test for CAP style
Merge remote-tracking branch 'irstv/master' into fix/st_ringbuffer
Merge unit test source code asserts, use more robust test in ST_RingBuffer
Restore license header, reformat code [ci skip]
Merge pull request #303 from nicolas-f/fix/st_ringbuffer

Remove BUTT in ST_RingBuffer and add unit test