[O] table column justification letters impotent in lowercase

[bruce robertson]

Doesn't match 8.3 manual nor 9.0.9 online manual.

Org-mode version 8.3beta (release_8.3beta-1062-gce4e64 @ /Users/brucer42/git/org-mode/lisp/)

GNU Emacs 25.1.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 Version 10.9.5 (Build 13F1911)) of 2016-09-20

|   |   |   | <r>            |   |

|   |   |   | 4              |   |

|   |   |   | bunch of stuff |   |

|   |   |   | 5              |   |

|   |   |   | 6              |   |

|   |   |   | 7              |   |

|   |   |   |            <R> |   |

|   |   |   |              4 |   |

|   |   |   | bunch of stuff |   |

|   |   |   |              5 |   |

|   |   |   |              6 |   |

|   |   |   |              7 |   |