Gz: Words added and removed

I've just added some words, changed some words and removed some other
words from Gz.

Those added are:

  Spell   Phon.    Means
  -----   -----    -----
  y'wtw   i'jutu   Common greeting and blessing.
  ywt     jut      Yes
  Neqkk   ne3x     No

Those changed are:

- hen (previously "farm", now "straw")
- the word for "mountain" (previously brynfryhs, now brynwfryhs,
  phon: 'brInufrIT

Note that a hill is _bryn_ and the peak of a mountain is _fryhs_.
So the word for "mountain" is something like "slope and peak".

Six root words were removed altogether (including some that I borrowed
to translate some sentence or other but which, in hindsight, don't
belong in the language).

Adrian.