Saito->Nolan issues

[arpee]

• [x] Nan Saito send warning

Process hangs on the 'sending' overlay:

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• [x] Fee display in explorer should be updated to nolan...

[arpee]

• [x] users should not be able to add more than 8 decimal points of precision.

[arpee]

• [x] Users should not be able to send more than they have.

We have an alert that stops them - but there is no reason to accept more than 10^9...