Create a new root patch: { name:[user.name], tag:[see tag spec], type:"root" }. User is owner/modifier/creator.
Create link from user to root patch, type = "admin".
For each patch owned by user:
1) create link from sub-patch to root patch, type = 'child'
2) set the _acl property of the child patch to the root patch
Proposed migration steps for each user
Synthesize user.tag (see tag spec, Issue #444).
Create a new root patch: { name:[user.name], tag:[see tag spec], type:"root" }. User is owner/modifier/creator. Create link from user to root patch, type = "admin". For each patch owned by user: 1) create link from sub-patch to root patch, type = 'child' 2) set the _acl property of the child patch to the root patch