Fortran support becomes optional, default: --fc-support=on

[bast]

If the code is configured with Fortran support, the Fortran bindings are tested.

This change also makes it possible to select the Fortran compiler via the setup line.

[bast]

Sorry this is not correct yet, I need to change the Appveyor recipe.

[codecov-io]

Codecov Report

Merging #65 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #65   +/-   ##
=======================================
  Coverage   42.29%   42.29%           
=======================================
  Files          78       78           
  Lines        1785     1785           
=======================================
  Hits          755      755           
  Misses       1030     1030

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[bast]

Contrary to what I recommended in #62, Fortran support is ON by default and now sleeping on it I think it's fine. If you think this is not what we want, I can change that.

[robertodr]

I think this it should be OFF by default. This is a C++ code with optional Fortran bindings. If I want to use it in a C++ code and I have no idea about Fortran at all, it is going to be very surprising to see stuff fail because of a component I don't need.

[bast]

OK I will change to OFF.