RFT: Renamed 'checker' to 'checkDirAndCreateIfMissing' to avoid misunderstandings about what the method actually is doing.
FIX: The Resolution File Cache now checks, if a processed image was moved to the expected destination and throws an Exception if it did not happen.
FIX: The recursive creation of the yag temp directory is now handled as expected, removing the changes of a previous commit where make_deep was used.
FIX: The cached resolution file of an image is now recreated, if the file was deleted but the database record still exists.

ATTENTION: This commit might be a breaking change, if the API methods from FileSystem_Div are used outside the yag extension!