[linearelliptic.discretizations.block-swipdg] added first draft
[examples.linearelliptic.block-swipdg] added first draft
[dune.module] update
[problems.default] moved out of playground
[problems.ESV2007] moved out of playground
[linearelliptic.discreteproblem] moved out of playground
[linearelliptic.discretizations.base] moved out of playground
[linearelliptic.discretizations.cg] moved out of playground
[linearelliptic.discretizations.swipdg] moved out of playground
fixed some broken includes from the move
[lib] added libdunehdd
[linearelliptic.discretizations] fixed some problems
[problems] added to lib
[linearelliptic.discreteproblem] added to lib
[linearelliptic.discretizations.cg] added to lib
[linearelliptic.discretizations.swipdg]
updated dune-stuff include path
update space chooser tag
[linearelliptic.discreteproblem]

Moved the dune-grid-multiscale related stuff to playground.
[linearelliptic.discretizations] added dune-grid-multiscale ctor