Implement the copy constructor for DiscreteFunction

See merge request !19

change the default DataTransferOperation to INTERPOLATE

See merge request !24

Make TreeContainer default constructible and thus allow matrix containers

See merge request !5

Instantiate ProblemStat and ProblemInstat for YaspGridBasis explicitly

See merge request !10

virtual inheritance of ProblemTimeinterface in ProblemInstat

See merge request !20

boundary-manager traverse over leafgridview

See merge request !21

add doxygen closing comment bracket

See merge request !18

Cleanup of examples for stokes equation

See merge request !17

densematrix view for sparse matrices

See merge request !15

check whether BACKEND is either MTL, EIGEN, or ISTL

See merge request !13

add expression abs() to gridfunctions

See merge request !7

make some operations constexpr and add missing inline

See merge request !9

DirichletBC: Use specialization for Constraints instead of general case

See merge request !3

make linear_algebra backend packages required if BACKEND is selected

See merge request !8

correct dimension in datatransfer checkInside for surface grids

See merge request !12

import mtl::size for size of std::vector

See merge request !11

Update GlobalBasis after globalRefine in the initialize() method

See merge request !4