Add method to merge several validation results to one

[vjik]

I see two ways.

1) Create static merger: ValidationResult::merge($result1, $result2, ...)

2) Add method that add errors from another result: $result1->addResult($result2, $result3, ...)

[samdark]

Is that common operation?

[vjik]

I need from two instances get one instance.

[samdark]

$result1->add($result2, $result3, ...)