Crosswalking a dataset's metadata now looks up the creator id and fetches
researcher details from Mint.  Still failing a bunch of tests, and the
researcher details need to be properly tested for in 006 and/or 007
If there's no argument to runtests.sh it now runs prove, which runs all the
test scripts and collates the results.
Fixed bugs in tests introduced when making people lookups work.
Added a hacky way to ignore handle prefixes so that I can test against
a Mint server which has no handle prefixes, just encrypted IDs.
Staff metadata now goes in child elements of <creator>.  Metadata conversion
tests now check all the staff details, not just the ID.