[tests.elliptic-discretizations] use ALUGrid instead of deprecated AluConformGrid
[tests.elliptic-estimators] use ALUGrid instead of deprecated AluConformGrid
[tests.operators_products] use ALUGrid instead of deprecated ALUGrid types
[tests.operator_oswald] use ALUGrid instead of deprecated AluConformGrid
[tests.operator_reconstructions] use ALUGrid instead of deprecated AluConformGrid
[tests.operator_oswald] use ALUGrid instead of deprecated ALUGrid types
[tests.elliptic-sipdg-discretization] use ALUGrid instead of deprecated ALUGrid types
[tests.elliptic-swipdg-discretization] use ALUGrid instead of deprecated ALUGrid types
[tests.elliptic-estimators] reenable tests