The latter is deprecated in dune-geometry 2.8-git

[box] In elementsolution.hh use Dune::ReservedVector instead of Dune::Blockvector to have a fixed maximum size at compile time.

enablegridgeometrycache

Bernd Flemisch authored Oct 09, 2019 and Katharina Heck committed Oct 10, 2019

Treat files where old names are deprecated.

Constructing a geometry may be expensive depending on the grid
implementation.