Generate an error message if an external auth username is already in use.
If changing authentication method, or authentication username for a user
and that username is already in use within that auth method, Mahara was
hitting an unrecoverable error because of unique constraints in the
database.
Adding this to the validation stage give sa much more appropriate error
message.
Signed-off-by:
Andrew Robert Nicols <andrew.nicols@luns.net.uk>
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