Also moved AutoDiffHelpers.hpp content to Opm namespace, and modified other files as required by these two changes.
instead of relying on relying that some header includes it...
The former is more assertive than the latter and provides better diagnostics. Incidentally, switching to *_EQUAL() also fixes an assignment that was (probably) intended to be an equality test: BOOST_CHECK(count = num) in both test cases.
