Re-create term portal disk images on re-import

Problem

On tbx re-import, there is check which validates if there is an image in the database with same contentMd5hash as the image from the file. If this is true the next image is  being processed. Here additional check is required which will also check if this image does exist on the disk, in case this image does not exist on the disk, we should re-create it.

In addition we should log the number of the imported images during the import.

(

Logging is done here:
editor_Models_Terminology_Import_TbxFileImport->importXmlFile()
)

In addition, in case the user clicks on missing disk image in term portal should we add additional info how this can be fixed ? Implement this in case it make sense or ask marcmittag it implementing this is worth.