Add author map file
Add conversion script for dune-geometry
Add conversion script for dune-localfunctions
Some changes to the set of files that get their trailing whitespace cleaned up

- Removed m4 files (might be dangerous as pointed out by Christoph)
- Removed tex files (not that important and might have trailing whitespace due to AucTex)
- Added CMakeLists.txt and .cmake files (Christoph said those are unproblematic)
Add reposurgeon workaround to allow loading of the dune-grid-dev-howto repository

Reposurgeon crashes when trying to load the dune-grid-dev-howto repository because it
cannot find a branch root at some point. This patch adds a workaround that can be
enabled by setting the "svn_accept_orphan_branches" option in reposurgeon.
Add conversion script for dune-grid-dev-howto
Add conversion script for dune-grid-howto
Add conversion script for dune-istl
Add rename for overlooked branch in dune-istl
Fix tag metadata for tags that already existed before the releases/ -> tags/ rename

Even though we deleted the underlying commit, the tags retained the metadata of those
commits (date, author, commit message). Fixed by deleting and recreating the tags.
Add some comments to dune-istl conversion script
Add conversion script for dune-common
Make sure we really delete bogus commits in dune-grid-dev-howto conversion
Make sure to apply special Alberta fix in dune-common conversion

dune-common used to contain the grid interface as well, and since we are
rewriting the complete history, we need to apply the fix.
Add comments to dune-grid conversion script and fix some tag issues