Typedefed structs to fit in with the other libraries
Added metadata removal option to json-metamod

Added new program json-metasuper to supersede metadata

Added functions to insert error records into JSON return values

Enabled skipping of empty string values in AVUs
Renamed has_avu to contains_avu
Fixed a memory leak identified by valgrind
Added checks to free memory on errors
Merge pull request #15 from keithj/devel

New metadata supersede program