surf::Error does not implement std::error::Error

(I'm happy if you choose to mark this as a duplicate - my main goal is to increase the googlability of this aspect of the current code).

A workaround (I suspect, working on it now) is to implement a newtype and wrap everything that encounters surf error types.

The issue concerns surf::Error and its std::error::Error integration; start by locating the error definition and existing error conversions. Done means surf::Error implements the standard trait without requiring callers to wrap it in a newtype, with the affected error-handling cases compiling or passing their tests.

Written by the indexing model from the issue text.