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lookup() searches for symbols in the given binding and the enclosing scopes,
while find() searches for symbols only in the given binding.

Main reason is that find-usages and refactoring broke completely.
Second reason is that concurrent modification was done on the
children-list while deleting/destructing.

This reverts commit b0b95f88.

Patch by: Bill King

Task-number: QTCREATORBUG-534
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Encapsulate the details.