Another API update on March 1st
Add some more "same person" matches to compensate for a bug

Unfortunately, the external_id field wasn't being set for
candidates that had to be newly created, so these false
uncertainties arose.  This adds entries for all of those in
names-manually-checked.csv so that they will be associated
correctly.
Add a method to show current external IDs of positions for a person
Add "Contest Type" and "Mz Candidate Code" to names-manually-checked.csv
Remember to set the external_id on newly created Positions