Revert "[grid.provider] return shared instead of naked ptr" since it makes it impossible to wrap the returned object into unique ptr
Revert "[grid.provider] return shared instead of naked ptr"
since it makes it impossible to wrap the returned object into unique ptr

This reverts commit 4c0b32adb68060ecbe7dc97f60b7f53c09742cd4.

renemilk/DUNE-Stuff,renemilk/DUNE-Stuff,renemilk/DUNE-Stuff