vector lightweight debug mode

[François Dumont]

Hi

    Here is what I had in mind when talking about moving debug checks to
the lightweight debug checks.

    Sometimes the checks have been simply moved resulting in a simpler
debug vector implementation (front, back...). Sometimes I copy the
checks in a simpler form and kept the debug one too to make sure
execution of the debug code is fine.

    I plan to do the same for other containers.

    I still need to run tests, ok if tests are fine ?

François

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