RF: qe -> queryengine in adhoc searchlights __init__

not sure how it became qe there, while overloading queryengine passed
to the base class, but that is really not needed.  Since it is a
positional argument here -- I hope it would not break too much of
users code
ENH: remove description of queryengine from sphere_ sl factory methods __init__.__doc__
Merge branch 'master' of https://github.com/PyMVPA/PyMVPA