* correct, cleanup & simplify dwim stack
latlh chIS logh HeS qar wej chel laD
better errors
update find_file to new exception
* addressed latest comments
* test should not use realpath as it follows symlink
this fails when on OS X as /var is now a symlink to /private/var
but first_found was not supposed to follow symlinks
This change corrects problems reported by the `yamllint` linter.
Since key duplication problems were removed in 4d48711, this commit
mainly fixes trailing spaces and extra empty lines at beginning/end of
files.