Cleaned up Test::Deep::NoTest by making it call Test::Deep's import,
that way it will always be in sync for exports. Also added some POD
docs.
Added notest_extra.t to check that things are correctly exported and
working.
Add cmp_details but left it undocumented. It manages localising the
stack etc. Factored eq_deeply and cmp_deeply through that. This meant
adding an icky hack into deep_diag. I should clean that whole thing
up.
Remove $name from params of eq_deeply, in code and docs, it was
unused.