Fix <relatedsItem> element, cannot directly contain text

For the <item_-_DublinCore_-_Source>, the CUL specs specify that it
should be mapped to <relatedItem>. However, <relatedItem> can only
contain subelements, it cannot directly contain text. So, for now,
until I hear otherwise, the <item_-_DublinCore_-_Source> will map
to <relatedItem><note>
Regenerate MODS due to fix in <relatedIten>, cannot directly contain text

For now, the fix inserts a <note> subelement. However, the metadata group
may decide to use another subelement.
Use <titleInfo><title> for <relatedItem type="original">

Use <titleInfo><title> as the subelement for
<relatedItem type="original"> when mapping <item_-_DublinCore_-_Source>
Regenerate MODS due to change in <relatedItem type=original>