Link 2014-04-12_vanNH-at-pdxST in index
Workaround a bug in yaml::as.yaml()

If a factor has an NA, as.yaml() segfaults. Convert to character in advance to be safe.
Better handling of null placeholders for points where there is no score
Reprocess 2014-04-20_sfoDF-at-vanNH
Re-process 2014-06-07_seaRM-at-vanNH

Fixed a D for vanNH-8-hibbert in point 36