LAST LIGHT shelf 0.1.0

The prebuilt shelf that LAST LIGHT downloads on first run. This is data, not
code: there is no program in it. The app fetches it, checks it by length and
then by hash, and unpacks it into its own data directory.

size 73196259 bytes
sha256 85dacb04a56693295ffe23e2251f746a7250a366a475469eb1ce4fda43181e5c

What is on it, 5,955 documents:

• 5,934 Vikidia articles (https://en.vikidia.org), under CC BY-SA 3.0 or the
  GFDL, the same terms as Wikipedia.
• 21 survival and reference PDFs, 4,189 pages. Most are works of the US federal
  government and so are not under copyright in the United States: FEMA, USDA,
  EPA, USGS, HHS, the Army's Borden Institute, Oak Ridge. Two are public domain
  by age (Harding 1907, Gibson 1881, Hasluck 1917). One carries a written grant
  on its own page (the SODIS Safe Water School manual).
• Three of those 21 are Hesperian titles under CC BY-NC-SA: Where There Is No
  Doctor, Where There Is No Dentist, A Book for Midwives. Non-commercial.

Two plain text files travel with it. ATTRIBUTION.txt carries the Vikidia credit
and licence, which a share-alike licence requires and which the app enforces:
it refuses to unpack a bundle that does not have it. SOURCES.txt lists every
document and why it is free to pass on.

Anything whose terms could not be established in writing was left off rather
than guessed at. The corpus this was cut from holds 109 PDFs; 88 of them are not
here.