[operators.projection] add over_integrate to L2Projection
[operators.projection] add over_integrate to Projection
[test.elliptic-swipdg...] simplify eta_R
[test.elliptic-swipd...] use over_integrate in eta_R
[localevaluation.swipdg] whitespace
[operators.fluxreconstruction] add over_integrate
[test.elliptic-swipdg...] remove dead code
[test.elliptic-swipdg...] over_integrate = 1 is enough
[test.elliptic-testcases] force order of 2 is enough in ESV07