Fix issue with grid_second_order hanging when encoding fields with Infinite values

[pmarguinaud]

Enabling grid_second_order encoding does not fail when the field to encode contains Infinite values. Instead, it never terminates.

This PR :

• adds a test to highlight the problem
• adds a test in grib_scaling.cc to fix the issue; make the program abort when infinite (or nan) values are encountered

[pmarguinaud]

Apparently, you added the test case yourself to develop. I just had to add it in "examples/F90/CMakeLists.txt".

Is that correct ?

[shahramn]

Dear @pmarguinaud
I had to merge all your changes manually to our "develop" branch. The other PR had too many conflicts.
Please take a look at the latest develop to double-check.
By the way there was another bug which I fixed: The error argument to the call
grib_get_binary_scale_fact()
was not being checked by its callers.

Many thanks