Summary of important user-visible changes for optiminterp 0.3.4:
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 ** Makefile fixed to work with non-standard linker options e.g on
    Apple.

 ** Package is no longer automatically loaded.

 ** Add test script which compares the solution of the local optimal 
    interpolation to the global optimal interpolation.

 ** Add the DIVA kernel (data-interpolating variational analysis) as
    a compile-time option (CPPFLAGS must conaint 
    -DBACKGROUND_COVARIANCE_DIVA)
