PING: [PATCH diagnostics] Handle two locations for the same diagnostic. Convert all gfc_warning_1 and gfc_notify_std_1 calls

[Manuel López-Ibáñez]

PING: https://gcc.gnu.org/ml/gcc-patches/2015-05/msg00772.html

The Fortran part was already approved, only the diagnostics part is pending.

Thanks,

Manuel.