list views with sequence columns must be sortable

Registered by Ferdinand

see
https://bugs.launchpad.net/openobject-addons/+bug/321844

technically it's ok but it's a major usability issue not being able to sort
one thing is the sequence, the other - if all tasks have the same sequence - one must be able to sort these

I have proposed already many times that all list must be sorted in a "human" (alphabetical) way - not by id's or "random"

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