[playground.functions] removes deprecated pdelabadapter and norm
[la] fixes IstlDenseVector's size method
[tests] adds test for corner range
[common] fixes corner range implementation
[tests] adds new (disabled) grid types for provider types

@tobiasleibner please have a look at this todo and the one in
common_ranges.cc sometime, prolly needs some changes to the grid
provider implementation to enable the embbeded grids
[fem] fixes fem-eoc compile