Point to helping flags in tutorial.
Make some reduction print there acc_dtype.
use more direct fct call.
Make Shape_i.__hash__ always return an int, not an numpy.int64 when i is such an object.

fix gh-2099
Merge pull request #2101 from nouiz/mixed

Mixed
Merge branch 'master' of https://github.com/Theano/Theano into profilingOutput