simonmar committed rGHCbe0ce8718ea4: Fix for crash in setnumcapabilities001 (authored by simonmar).Fix for crash in setnumcapabilities001
getNewNursery() was unconditionally incrementing next_nursery, which
is normally fine but it broke an assumption in
storageAddCapabilities(). This manifested as an occasional crash in
the setnumcapabilities001 test.