[tests.elliptic-swipdg...] don't be final in the EOC study
* we need to override those in the estimator study
[tests.elliptic-swipdg...] updated EstimatorStudy
* new labels
* added override and final keywords
* disable currently broken/untested stuff
* add energy norm
[tests.elliptic-swipdg...] use oswald interpolation operator
[tests.elliptic-estimators] clean up
[tests.elliptic-swipdg...]
* added missing override final
* whitespace
[tests.elliptic-discretizations] whitespace