add comments column

note some of the heterogeneity in what these identifiers identify.
Update link_types_vocab.csv
fix column counts
Merge pull request #6 from smrazgs/patch-1

add comments column
fix sos 2 typo
add status, targetProperty, and submitter fields

for better registry operation. example content in new fields
change link_type to termURI
Merge pull request #1 from smrazgs/patch-3

Patch 3