Fixes #550 History view shows wrong file list for root changeset (revision 0).
Created originally on Bitbucket by colin-hurley (Colin Hurley)
Was already merged in Bitbucket before import, marked as merged by the import user
For root changesets, the change list is now obtained using a correctly-formed "hg status" command. A root changeset has no parents, so the "--change" option is used to retrieve the status because it does not require a parent changeset to be specified.