bzxmltophill is a tool that takes the bugs.xml file generated from the
bugzilla /xmlrpc.cgi interface and converts it to the JSON format used
By using bzxmltophill, it is possible to migrate projects and tasks
from a Bugzilla instance to Maniphest (if you don't look too close).
Be warned: there are plenty of rough edges, a lot of stuff cannot be migrated
and some stuff that could be migrated is ignored because we didn't care enough
to bother. But it worked for us, so YMMV.