Feature/update to dune 3.0

This is based on merge request !4 (merged)

Hi, gitlab says 'This merge request contains merge conflicts." And indeed, there are a few commits that are not needed anymore, e.g., the introduction of the setPosition method. Please rebase and update the merge request. Thanks!

Added 21 commits:

• 7df78a7a...b2df4a5e - 6 commits from branch master
• b0a04b06 - [cleanup] Remove backwardscompitibility #ifs with dune 2.3
• 05eb1a00 - Use more range-based for better readability
• 7658c0a6 - [test] Use range-based for in the test
• 620dbfaf - Silence warnings from array initialization
• 7b5024c4 - [dgf] Remove use of EntityPointer
• 4dc077ef - [cmake] Bump up cmake version, use enable all packages
• 73308f44 - [cmake] Do not exclude subfolder dune from all
• 2bf0d103 - [buildsystem] Remove autotools support
• 2b6f5463 - [test] Use new dune_add_test macro
• 2b491598 - Remove deprecated header include
• f144e002 - Use shared_ptr from std namespace
• 62c4ef88 - Remove deprecated isParallel capability
• 207fe0cf - [mpi] Maybe add mpi instance when using structured grid factory
• 2a5e6b6a - [views] Use default leaf and level views
• a473739c - [gitignore] Add default ctest test result directory

Added 17 commits:

• a473739c...8c871f08 - 2 commits from branch master
• 04c06d84 - [cleanup] Remove backwardscompitibility #ifs with dune 2.3
• fff3d530 - Use more range-based for better readability
• cbe2ae59 - [test] Use range-based for in the test
• ca71e35d - Silence warnings from array initialization
• bae196dc - [dgf] Remove use of EntityPointer
• b6096185 - [cmake] Bump up cmake version, use enable all packages
• a98966a5 - [cmake] Do not exclude subfolder dune from all
• 582d517f - [buildsystem] Remove autotools support
• a1762877 - [test] Use new dune_add_test macro
• fdcbe016 - Remove deprecated header include
• 0f58e7ce - Use shared_ptr from std namespace
• 3b097a89 - Remove deprecated isParallel capability
• 74c206ac - [mpi] Maybe add mpi instance when using structured grid factory
• a3cdfb27 - [views] Use default leaf and level views
• 8c0e6c45 - [gitignore] Add default ctest test result directory

Sry for the double rebase, I missed a conflict with the recently merged boudary segment signature fix.

mentioned in commit 92982b2e

Status changed to merged