Also included abort() method on progress object.
What's left:
o put incremental update in looping thread(s) to let system bootstrap from nothing
o deal with store/webapp going away
o deal with virt server down
o Switch to using virtualized snapshot instead of HEAD in staging
o testing... and lots of it
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@6063 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
