Update the tutorial example on random numbers to account for the default_update mechanism. Update the corresponding test.

disable the grad of ConvOp when dx or dy!=1 as their seam to have a bug their. Don't repair now as this don't seam to be used.

Prepare for default updates of shared variable. Keyword "no_default_updates" in theano.function added.

own code-version identifier

Fixed the numeric-gradient algorithm to return Inf error if any of the numeric errors is NaN or Inf.

E.g.  cmplx_value + 1.