Revert "#220"

This reverts commit 31dfc9afd53807c237d15b44fe73096d96f780a9.
Revert "Revert "Recaching of DB images extended""

This reverts commit 800b76e5effc50e9cc00bff14029421fb1cc60c7.

	modified:   zp-core/zp-extensions/cacheManager/cacheDBImages.php
	modified:   zp-core/zp-extensions/cacheManager/cacheImages.php