geography/gama: Update to 2.05

Version 2.05 May 2019

* The program gama-local for adjustment of local surveying networks
  used a C++ class Acord for computing approximate coordinates of
  adjusted points, if these were not explicitly given on
  input. Acord's computations were based on intersections (and local
  transformations if necessary) of the tuples of determining
  observations (for example a bearing and a distance). Gama-local
  expected input data to be free of blunders, which might be a strong
  assumption in practice.

  New class Acord2 was introduced as a robust alternative for typical
  two dimensional input configurations (Acord2 is not a complete
  general solution yet); the idea is to find all (or as many as possible)
  solutions of coordinates of a selected point and use their median as
  the robust position estimation. Algorithm Acord2 is followed by the
  original Acord intersections in gama-local, before the adjustment
  solution of the network. Acord2 is based on the master's thesis by
  Petra Millarov叩 <petramillarova@gmail.com>

(gdt)