JumpDownstreamSelector bug fix
So, for a FoldTree such as: FOLD_TREE EDGE 1 115 -1 EDGE 1 116 1 EDGE 116 221 -1, a call like:
ResidueSelectorCOP jump( new JumpDownstreamSelector( 1 ) );
ResidueRanges ranges( jump->apply( pose ) );
will create a ResidueRanges[1] of 116-220, missing the last residue of the chain.
This change should solve this issue.