Patch for VS: operator < for RopeIterator

Hi,

The checked STL of VS won't compile the rewritetest if the iterator hasn't
an operator < (it check the begin iterator is preceding the end). Just a
small patch for adding it.

(the ropeiterator don't comply to the RandomIterator concept, even if
declared so. I suppose it is just a fast hack, fleshed out as needed)

Regards,

ropeiter.patch (498 Bytes)