After autocomplete, populate author field with a combination of username and real name to avoid confusion

This is best illustrated with an example. Take the following user, with username=foo, and their real name (eg, profile node title) = bar. When searching for, and selecting from the autocomplete, bar, the author field is populated with 'foo'. This was confusing to many end users. The attached patch does the following:

1) Populates the author field with USERNAME: REAL NAME
2) Adds a validation function that runs before node_validate to replace the above pattern with USERNAME so that the proper author is found

Thanks,

Jonathan