Allow for newlines, node URLs, and path aliases in the related content CCK text field

Currently if the related nodes are grabbed from a CCK text field it assumes that the text is like:

123,153,171

where these are the node ids.

Allow for these to be the URLs of the site as well as allow for them to be on separate lines like:

node/123
some/path/here
node/171

The paths will still need to be for *nodes* (non-nodes are not supported) but putting the alias in there is more user-friendly.