More doc in wrangler package.
Renaming vt/topotools to vt/topo/helpers.
Moving Scrap and ChangeType to newly created topotools.
moving rebuild to topotools.
Adding forward compatibility for locking.
Merge branch 'master' into replication
Making default timeout make more sense.
Make flagutil test succeed deterministically.
Merge pull request #39 from msolo/fix_flagutil

Make flagutil test succeed deterministically.
Cosmetic code fix in flagutil.