prev: jump to parent's successor if parent is obsolete and topic is involved `hg stack` shows a linear chain of commits even when they are not linear chain and some changesets are obsoleted and have successors as separate head. This is very nice to have a post evolution view of the stack. However when `hg prev` is run on an unstable changeset whose parent is obsolete and does not topic but parents successor has the topic, it shows no parent on the topic. This patch makes `hg prev` update to parent's successor and make things follow the stack order.

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# utility to setup pythonpath to point into the tested repository

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export SRCDIR=`dirname $TESTDIR`

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if [ -n "$PYTHONPATH" ]; then

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    export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH

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    export PYTHONPATH=$SRCDIR:$PYTHONPATH

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else

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    export PYTHONPATH=$SRCDIR

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fi