Revert "Removed src/math/interaction.[ch] which has been superseded by categoricals...
authorJohn Darrington <john@darrington.wattle.id.au>
Fri, 21 May 2010 11:03:03 +0000 (13:03 +0200)
committerJohn Darrington <john@darrington.wattle.id.au>
Fri, 21 May 2010 11:03:03 +0000 (13:03 +0200)
This reverts commit a456c361c0d324475da63d8420a2f0b108b61243.

It's still needed after all.


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