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box: implement persistent sequences

This patch implements a new object type, persistent sequences. Sequences
are created with function box.schema.sequence.create(name, options).
Options include min/max, start value, increment, cache size, just like
in Postgresql, although 'cache' is ignored for now. All sequences can be
accessed via box.sequence.<name>, similarly to spaces. To generate a
sequence value, use seq:next() method. To retrieve the last generated
value, use seq:get(). A sequence value can also be reset to the start
value or to any other value using seq:reset() and seq:set() methods.

Needed for #389

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