Fix typo in error message
Increase logging
Initial fix for unparsed metadata (See #12358)

This is only a band-aid over the issue of
table values being possibly non-scalar. Either
we will need to provide a getter that flattens
all values, or agree upon some API such as
DVExtHdrFields extending java.util.Map to make
this tractable.
Strip reference to DVExtHdrFields
Remove import and add main tester
Support RFloat from ModelMapper
Merge pull request #2695 from joshmoore/rebased/dev_5_0/12358-parse-metadata

12358 parse metadata (rebased onto dev_5_0)