[linear_path]/[spline_path] adjust to new GemBasePath interface
GemPathBase: use gem::RTE::Array for the garray
Use gem::RTE::Array for interpolation functions
constified gem::RTE::Array
RTE/Array: include "Gem/RTE.h" for t_float
[linear_path]/[spline_path] simplify example patches
[linear_path]/[spline_path]: check existence of array whenver we access it
Cleanup example patches