add support for TSN: taxonomic identifier prefixes

[jhpoelen]

in https://github.com/mammalbase/database, @karilint uses TSN prefixes to reference taxonomic serial numbers issued by ITIS .

e.g., the TSN for Enhydra lutris is 180547 and an html landing page about this taxon can be found at:

https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=180547#null

and attached screenshot below.

currently, GloBI uses ITIS: prefixes to reference ITIS taxonomic serial numbers.

desired is to make GloBI also support using a more intuitive TSN: (or tsn:) prefix to reference ITIS taxonomic serial numbers.

[jhpoelen]

via Nomer v0.5.2, the tsn: prefix is supported.

For example,

echo "tsn:946010"\
 | nomer append --include-header itis\
| mlr --itsvlite --oxtab cat

yields

providedExternalId      tsn:946010
relationName            HAS_ACCEPTED_NAME
resolvedExternalId      ITIS:946010
resolvedName            Rhinolophus sinicus
resolvedAuthorship      K. Andersen, 1905
resolvedRank            species
resolvedCommonNames     
resolvedPath            Animalia | Bilateria | Deuterostomia | Chordata | Vertebrata | Gnathostomata | Tetrapoda | Mammalia | Theria | Eutheria | Chiroptera | Yinpterochiroptera | Rhinolophoidea | Rhinolophidae | Rhinolophus | Rhinolophus sinicus
resolvedPathIds         ITIS:202423 | ITIS:914154 | ITIS:914156 | ITIS:158852 | ITIS:331030 | ITIS:914179 | ITIS:914181 | ITIS:179913 | ITIS:179916 | ITIS:179925 | ITIS:179985 | ITIS:945840 | ITIS:945842 | ITIS:631242 | ITIS:631260 | ITIS:946010
resolvedPathNames       kingdom | subkingdom | infrakingdom | phylum | subphylum | infraphylum | superclass | class | subclass | infraclass | order | suborder | superfamily | family | genus | species
resolvedPathAuthorships 
resolvedExternalUrl     http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=946010