* The compiler can provide many non-explicit constructors for
aggregate types. This is sometimes desired, but it can
happen accidentally, resulting in run-time errors.
* This commit assures that no types are aggregates unless existing
code is using aggregate initialization.
A full ledger on the production Ripple network could
exceed the default maximum reply size for the
HTTPClient code. Remove the reply size maximum for
responses that include a Content-Length header.
