[Proj] Testing framework

[Even Rouault]

> I can do it next after the weekend  (public holiday in PL and long
> weekend away).
> Luckily, FindGTest guesser for CMake comes with the official package
> since CMake 3.0.
> I can also do it for Autoconf.

Oh well... I had a take at the autoconf setup and got it working, so that's 
good enough for now. I'll appreciate if you/someone else can take care of the 
cmake integration.

https://github.com/OSGeo/proj.4/pull/1024

Kurt, what is the gunit.h header you include in your tests ? Can't see that in 
googletest.

Even

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