Usefull to track the overhead of theano fct call.

Committing before actual changes take place.

THEANO_FLAGS and THEANORC environment variables are now right-dominant (right-most definitions have precedence over the ones on their left)

Replacing numpy.asarray by theano._asarray when a dtype conversion may be performed, to work around Numpy ticket 870 defect

added option that, bu default, disables linking against -framework. Re-enable, if needed, by setting cmodule.mac_framework_link to True

disable theano.sparse when scipy version is too old. skip the test of theano.sparse in the same condition.

This lower the number of nosetests when we won't use the sparse code.