[Health] Should PUID be a compulsory field when creating new patients?

[address@hidden]

Hi Luis

I have just noticed that when creating a new "patient" in GNU Health 
that the PUID field is optional. I think that it should be made a compulsory 
field otherwise it will be possible to create duplicated records for the same 
patient. And we all know what havoc that creates...

Regards

Andrew