Review "Prior standards" and decide to either Retire/Recommend

[peterdesmet]

There are currently 13 prior standards: https://github.com/tdwg/prior-standards

Given that:

• We would like to get rid of the prior standard category (Review standard statuses #20)
• For most/all these standards there is no custodian
• For most of these standards we have very little information (sometimes not more than the title: Write page for Botanico-Periodicum-Huntianum + Supplementum website#121)
• The latest publication date is 1996
• Some standards are still used (e.g. https://github.com/tdwg/wgsrpd)

... the 13 prior standards should be reviewed by the @tag and it should be decided to either retire or recommended these. If they are recommended, they should get their proper repository (like was done for https://github.com/tdwg/wgsrpd) and custodians. An easy way forward would be to send a message to the community that each of these standards will be retired in 90 days, unless there is objection (for specific standards) and willingness to maintain (or at least much better document) these. I'll leave it to the @tag to create separate issues for the discussion of each prior standard.

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The 13 prior standards are:

Standard	Publication date
Botanico-Periodicum-Huntianum	1970
Botanico-Periodicum-Huntianum/Supplementum	1971
Taxonomic Literature (TL-2)	1976
Floristic regions of the world	1986
International Transfer Format for Botanic Garden Plant Records (IFT2)	1987
Index herbariorum. Part 1, The herbaria of the world	1990
A Language for the Definition and Exchange of Biological Data Sets (XDF)	1991
Authors of Plant Names	1992
World Geographical Scheme for Recording Plant Distributions (WGSRPD)	1992
Economic Botany Data Collection Standard	1995
Plant Names in Botanical Databases	1995
Plant Occurrence and Status Scheme (POSS)	1995
Herbarium Information Standards and Protocols for Interchange of Data (HISPID3)	1996

[baskaufs]

Each of these standards now has a proper landing page to which their permanent URLs dereference. So to some extent that deals with this issue. The other aspects can be subsumed by the new issue #37