New terms for origin and establishment status

[ramonawalls]

Transferred here from BiodiversityOntologies/bco#30, from @qgroom:

On specimens and in Floras one often comes across comments such as 'introduced', 'casual', 'native', 'planted', 'escaped', which give information about the origin of the organism at the site. These terms are also related to how well established the organism is at the site, but there are additional terms such as 'persisting', 'spreading', 'invasive', 'relic', which relate only to how well established the organism is at the site and if it is reproducing.

Requires some investigation to find out where terms such as neophyte and archaeophyte come from and whether there are preexisting vocabularies.