Retain the intersphix cache for a year.  Negatives don't work.
Add the logger module.
Test `memoized_property`.
Test setter and deleter in module-level properties.
Memoized module-level properties.
Yield the file object in `ensure_filename`.
Start the change log for 1.6.1.
Fix issue with ensure_filename and mode "r+b".

Mode "r+b" won't create the file.
Re-backport makedirs from Python 3.4.1. See [21802]_.

.. [21802] http://bugs.python.org/issue21082
Add function `concatfiles`.
Fix the xoutil.fs documentation.
Jump to 1.6.1.
Merge branch 'release-1.6.1'