ValueNode splitting by pipe as Operator.

[kiivihal]

The Mais-Flexis Archival system exports repeating fields as pipe separated, i.e. |.

This means that the data needs to be split at the record level in order to be processed into separate fields.

• Pipe-Delimited in the 'code-tweaking' interface
• Groovy script recognizes the various split options Operator.java
• Splitting into "@resource" attribute duplicates target fields similar to how literals are treated.

See also #499