DLN: improved ancestor-descendant join algorithm, which was now too slow on larger  node sets. Avoid as node id comparisons where possible. Moved algorithm into the index-access method (not a clean design, but it reduces memory consumption). Avoid sorting already ordered node sets!
DLN: improved ancestor-descendant join algorithm, which was now too slow on larger 
node sets. Avoid as node id comparisons where possible. Moved algorithm into the index-access method (not
a clean design, but it reduces memory consumption). Avoid sorting already ordered node sets!

svn path=/branches/DLN/eXist-1.0/; revision=3609

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