Maid 356

required fields for account transfer in different personas
Not sure if it is still the case that one user is allowed to own multiple pmid_nodes.
If it is the case, then the Available Space will be the sum of all.
In the case when PmidMange notify some of the claimed pmid_node has low QOS,
it is necessary to figure out a mechanism how the total sum of available space to be modified to reflect that.