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LAST BUILD ON BRANCH fix-minute-bar-siblings

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BUG: Fix OSError when creating sids that share dir

Fix a bug where creating a sid bcolz file when the containing directory
was already occupied by a sid caused an OSError on attempt of creating
the directory because it already existed.

e.g. if there were two sids, `1` and `2`. The paths would be
`00/00/000001.bcolz` and `00/00/000002.bcolz` which share the same
directory `00/00`.

Fixed by checking for directory existence before calling `makedirs`.

Add test coverage which exercises writing of sids that are siblings in
the sid directory structure.