RF: remove python 2.4 compatibility routine

arff was using a version of functools.partial for compatibility with
earlier pythons; remove now we depend on 2.6 or greater.
Merge pull request #2703 from matthew-brett/remove-functools-copy

RF: remove python 2.4 compatibility routine
DOC: Format DCT references the same way as HOWTO
Merge pull request #2705 from endolith/patch-3

DOC: Format DCT references the same way as HOWTO