Ensure qt uses the COutPoint accessors
Ensure qt uses the COutPoint accessors

Summary:
As per title.

Depends on D1388

Test Plan:
  make check

Reviewers: #bitcoin_abc, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Subscribers: teamcity

Differential Revision: https://reviews.bitcoinabc.org/D1391

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