Configuration fail if gfortran necessary, but not built or available

When the host C compiler is used (either by calling '--host-cc' or on OSs
that we can't build the GNU C Compiler), Maneage will also not build the
Fortran compiler 'gfortran'. Until now, the './project configure' script
would give a big warning about the need for 'gfortran' and the fact that it
is missing, and would for 5 seconds, but it would continue anyway.

For projects that don't need 'gfortran', this can be confusing to the users
and for those that need 'gfortran', it means that a lot of time and cpu
cycles are wasted compiling non-fortran software that are unusable in the
end.

With this commit, the 'need_gfortarn' variable has been added
'reproduce/software/shell/configure.sh', in a new part that is devoted to
project-specific features. If it equals '0', then the 'gfortran' test (and
message!) isn't done at all, but if it is set to '1', then the configure
stage will halt immediately gfortran is not found and not built.

The default operations of the core Maneage branch don't need 'gfortran', so
by default it is set to 0. But 'gfortran' is necessary for all projects
that use Numpy (Python's numeric library) for example. So if your project
needs 'gfortran', please set this new variable to 1. As mentioned in the
comments of 'configure.sh', ideally we should detect this automatically,
but we haven't had the time to implement it yet.

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