GeographicLib 2.0 (released 2022-05-06)

Changes between 2.0 (released 2022-05-06) and 1.52 versions:

• Remove non C++ implementations from this package. These are now
  managed as separate packages. See
  https://geographiclib.sourceforge.io/doc/library.html#languages

• This allowed the cmake interface to be rationalized:

  • Replace GEOGRAPHICLIB_LIB_TYPE by BUILD_SHARED_LIBS (a standard
    cmake variable) and BUILD_BOTH_LIBS.
  • Remove COMMON_INSTALL_PATH and replace with variables to
    specify where various components are to be installed.
  • Remove BUILD_NETGEOGRAPHICLIB.
  • Remove legacy cmake config support (non-namespace).
  • make exampleprograms does a separate cmake configuration to
    mimic how a user's program might find GeographicLib.
  • find_package (GeographicLib) now sets and checks the value of
    GEOGRAPHICLIB_PRECISION.
  • Improve the separation of end-user and maintain cmake code.

• More careful treatment of +/-0d and +/-180d.

  • These behave consistently with taking the limits
    • +/-0 means +/-eps as eps -> 0+
    • +/-180 means +/-(180 - eps) as eps -> 0+
  • As a consequence, azimuths of +0d and +180d are reckoned to be
    east-going, as far as tracking the longitude with
    Geodesic::LONG_UNROLL and the area goes, while azimuths -0d and
    -180d are reckoned to be west-going.
  • When computing longitude differences, if lat2 - lat1 = +/-180d
    (mod 360d), then the sign is picked depending on the sign of
    the difference.
  • The normal range for returned longitudes and azimuths is
    [-180d, 180d].

• Programs in directory tests now allow testing to extend beyond
  invocations of the utility programs.

• BUG FIXES:

  • Fixed bug where in the solution of the inverse geodesic problem where
    with lat1 = 0 and lat2 = nan was treated as equatorial.
  • Fixed roundoff corner case in geodesic area computation (only
    triggered with long double).

• Minor changes in code:

  • Use fmin, fmax, fabs instead of min, max, abs, where appropriate.
  • Parameterize the conversion units for degrees, minutes, seconds as
    Math::qd, Math::dm, Math::ms.
  • Ellipsoid::MinorRadius() has be renamed Ellipsoid::PolarRadius().
  • Remove deprecated functions: XXX::MajorRadius, Utility::val, and
    placeholders (Math::cbrt, etc.) for C++11 math functions.
  • Can specify the comment character in Utility::ParseLine.
  • Rename various internal identifiers to avoid reserved names.
  • Remove unused internal variable in RhumbLine.
  • The documentation for EllipticFunction specifies restrictions on
    the arguments.
  • Put GeodesicExactC4.cpp back into GeodesicExact.cpp.

• Library file now called libGeographicLib.so, etc., instead of
  libGeographic.so.

• The .NET version of GeographicLib has been removed.