Disable nested inboxes.
Merge pull request #710 from 4teamwork/deif-inbox-nesting

Nested inboxes should not be possible any more
Fix link from readme to example repository xls file.
Update repository excel template/example file.

The new file contains detailed comments for each column.
Merge pull request #715 from 4teamwork/deif-update-repo

Update repository template file.
Preparing release 4.1.0
Back to development: 4.1.1