Changed type of column to allow for 0 - no column.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2013-07-20 02:37:32
Author local date 2013-07-20 04:37:32 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2013-07-20 02:37:32
Committer local date 2013-07-20 04:37:32 +0200
Commit 67b729e09775bf4fde3de1d0d2eebb14dea3b217
Tree ecb1a09409648b225d887fb2db148eefbb5dfdaa
Parent 3b7c70889fcf91a0cf1f4bd5121347d7d133e44b
Changed type of column to allow for 0 - no column.
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