Clarified when to register a type with OutputGuard

Typo fixes

Fix test

Add ceil_intdiv with associated tests.

Also rewrote with Olivier D. the comments and docstring to make it more clear.

Addition of new keys was not done in the new dict
Moved copymod to allow to use it in all tests value.

Added tests of some assumptions made on Numpy

Explain better why override some options in tests

Also some minor cosmetic changes to output.

Force the wanted device and floatX in the buildbot script.

Fix failing tests in tensor module

Doc str

A few small fixes

Elemwise should return both c_support_code and c_support_code_apply for the
scalar_op. It now does this and there is a comment explaining why.

Otherwise it may confuse users as nothing is printed to screen when it works.