[m-rev.] for review: optimise tree_bitset.delete

[Zoltan Somogyi]

On 20-Apr-2012, Peter Wang <novalazy at gmail.com> wrote:
> For review by Zoltan.

I haven't verified that the test case outputs are correct (since the diff
does not contain the inputs they are derived from), but the rest looks ok.

Zoltan.
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