searchlight hyperalignment tests fails sometimes

[nno]

Running travis for PR #454, the following test sometimes fails [1]:

======================================================================
FAIL: test_searchlight_hyperalignment (mvpa2.tests.test_searchlight_hyperalignment.SearchlightHyperalignmentTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/nno/PyMVPA/mvpa2/testing/tools.py", line 331, in newfunc
    return func(*arg, **kwargs)
  File "/home/travis/build/nno/PyMVPA/mvpa2/tests/test_searchlight_hyperalignment.py", line 245, in test_searchlight_hyperalignment
    assert(np.sum(max_weight == diag_weight) / float(len(diag_weight)) > 0.98)
AssertionError

Ping @swaroopgj
[1] https://travis-ci.org/nno/PyMVPA/jobs/122044397

[swaroopgj]

@nno Thanks Nick. It's an issue with the test being stringent. Will send a PR soon.

[nno]

Thanks @swaroopgj, looking forward to the PR (but no rush) :-)

[yarikoptic]

Was fixed by #456

[nno]

It fails occasionally with

assert(np.sum(max_weight == diag_weight) / float(len(diag_weight)) > 0.90)

can we use a value lower than 0.90 @swaroopgj?

See: https://travis-ci.org/PyMVPA/PyMVPA/jobs/131643694

[swaroopgj]

Thanks Nick. Relaxed the test values for a few tests. Hopefully, this will make them pass for almost all cases.
@yarikoptic Made a PR #474