Add a changelog entry

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+Deprecated: Many of the member functions of the FEInterfaceValues class, as well
+as the FEInterfaceViews::Scalar and FEInterfaceViews::Vector classes, that are
+used to compute jumps and averages of shape function-related quantities have
+been renamed in such a way that they are more expressive about what they
+compute.
+<br>
+(Jean-Paul Pelteret, 2021/07/31)