[validate] duplicate node names are now a fatal error
[validate] duplicate node names are now a fatal error

Auspice (v2) JSONs are not allowed to have duplicate names (it causes
Auspice to crash). This modifies the vlidate functionality so that it
identifies this (previously there was no warning).

nextstrain/augur,blab/nextstrain-augur,nextstrain/augur,nextstrain/augur