Rename Mage_Core_Block_Abstract::getHelper

[stalniy]

Mage_Core_Block_Abstract::getHelper should be renamed because it's not intuitively that this method returns a singleton block instance and by other hand Mage_Core_Block_Abstract::helper returns a singleton instance of helper.

[magento-team]

We have revised this method and found, that it is a legacy one with no usage in Magento code. So we have removed it at all and fixed the PHPDoc of Mage_Core_Block_Abstract::helper() method.

You can expect the changes to appear in the next publication.

Thank you for the notice regarding these methods.