Recommended: enable DwC terms identifiedBy and identifiedByID for Event core

[kingenloff]

Terms recommended for use to capture information about the people involved in various aspects of a survey (identifiedBy, identifiedByID ) are not enabled for use with Event core datasets. TDWG protocols need to be investigated to explore updating this.

Until this can be investigated and potentially updated, it's recommended that this information be captured at the occurrence level for each relevant event.