refactored to use write_as_json
not emitting empty $ properties
ignoring test cruft
simplified nexml from phenoscape
minor refactoring sitll failing 2 unit and 1 shell test
more test ignores
Preferred2LegacyNexson class and converter config
Preferred2LegacyNexson class and converter config
refactoring to Legacy2PreferredNexson class
moving to a nexson_syntax subpackage
refactor to helpers and Optimal2DirectNexson class
refactor to helpers and Direct2OptimaNexson class
documentation only
Nexson2Nexml and bug fixes
removing cruft