add an optional 'options' dict to Resolve (checked that old clients

add an optional 'options' dict to Resolve (checked that old clients
would not break)
go deeper yet in cleaning up the amount of extra fields in records
turns out CreateSliver actually needs to re-synthesize a whole lot of
data about users (for when account creation needs to take place)
in a truly federated environment this is not going to work, the
registry will never have enough data for account creation as this is
testbed-dependent
as far as I can tell this is a blatant flaw in the architecture
this code might work - accidentally - in a simple one-SFA-one-PLC
setup but this needs more work