Feature: python compile output

This adds the option 'console' (and 'terminal') for the DUNE_SAVE_BUILD environment variable to redirect the compile output to stdout and stderr.

added 12 commits

• 8d28adc9...c0f639f7 - 10 commits from branch master
• 664778b3 - [bugfix] make headercheck compile.
• e10c7064 - [feature][savebuild] Added options 'console' and 'terminal' to redirect

Compare with previous version

@andreas.dedner: I think this works for me. If you are ok, then I'll merge.

added 2 commits

• 81c1078a - [feature][savebuild] Added options 'console' and 'terminal' to redirect
• 1caead3e - [bugfix] move header implementing comm data handle to dune-grid.

Compare with previous version

enabled an automatic merge when the pipeline for 1caead3e succeeds

merged

mentioned in commit 50aff476