Check indent-tabs-mode in cleanup-buffer function
Don't set coding system in cleanup-buffer
Move some settings to init-external.el
Enable haskell-doc-mode
Update magit-status advice for renamed function

Magit commit 23f4f8dd3abe4dd7ee57d8edd62421f1f2c6daea introduced
magit-status-internal.
Clean up org-sort-heading-ignoring-articles
Clean up and comment org-sort-parent