Include more diagnostics in paypal outbound xfers in non-primary currency

We set the amount to -1, since Paypal doesn't show us the final number until
in a separate transaction. Include this information in the actual transaction
text, so we can see what is happening.
Ingore currency conversion records from Paypal

They generate both the payment transaction and one debit and one
credit transaction for the currency conversion. As currency conversion
happens very seldomly for our payments, we're just going to deal with
it manually, so therefor we will ignore the currency conversion records.