Changes

Summary

1. Extend the documentation of VT::point_values() (commit: 2493ddd) (details)
2. Implement PreconditionMG::get_multigrid() (commit: 7a65d0b) (details)
3. Fix size of data copied to constant memory and add missing include (commit: 9e553c5) (details)

Commit 2493ddd7d5bc16d3ad51bd12df663ee74dde2a6e by peterrmuench Extend the documentation of VT::point_values() (commit: 2493ddd)
	include/deal.II/numerics/vector_tools_evaluate.h (diff)
Commit 7a65d0bace24f3d33962d3eeeef37d76ec0d4964 by peterrmuench Implement PreconditionMG::get_multigrid() (commit: 7a65d0b)
	include/deal.II/multigrid/multigrid.h (diff)
Commit 9e553c57bf5f9734599bd70da49149358f115284 by Bruno Turcksin Fix size of data copied to constant memory and add missing include (commit: 9e553c5)
	tests/cuda/cuda_vector_05.cu (diff)
	include/deal.II/matrix_free/cuda_matrix_free.templates.h (diff)