#7 Marking item as changed when changing binding

[Denis S. Otkidach]

When binding for several items is changed item is not
notified about changes. There are 2 possible situations
when it matter:
1) class like StaticItemU or SmartStream (not yet
implemented) is used - we need item.touch() call;
2) ite.store() is redefined to make this item and other
bricks depending on it - we need item.store() call.
Certainly store() implies touch(), but store() can be too
slow for mass update.

[Denis S. Otkidach]

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Using store([joinField]). If it's too slow, you can optimize
it for cases when only certain fields (one field here) are
stored.