TST: making data even more "obvious" in test_multiclass_pairs_svm_searchlight

has failed during daily tests with MVPA_SEED=1353149908
RF: Move filtfilt monkey-patch under mvpa2/support/scipy/signal

Decided to go the 'difficult' way to resolve conflicts in local imports
of scipy under support via
from __future__ import absolute_import

Next commit will RF also stats under scipy/
RF: move support/stats under support/scipy/stats for consistency
BF: more pieces from scipy (_arraytools) to fix up running/testing on elderly precise
BF: doctest our copy of filtfilt and relax precision for output float
BF: Deal with various (ongoing) external API changes

'import mdp' still triggers the PLS deprecation from sklearn.
DOC: New PNAS paper.