New options CPP_DEBUG_FLAGS etc.

I suggest to add new configuration flags CPP_DEBUG_FLAGS etc., which allow passing special CPP flags for debugging. These complement the existing C_DEBUG_FLAGS and the (global) CPPFLAGS. In particular, I suggest to add the following flags:

CPP_DEBUG_FLAGS FPP_DEBUG_FLAGS CPP_OPTIMISE_FLAGS FPP_OPTIMISE_FLAGS CPP_PROFILE_FLAGS FPP_PROFILE_FLAGS CPP_OPENMP_FLAGS FPP_OPENMP_FLAGS CPP_WARN_FLAGS FPP_WARN_FLAGS

Applications are e.g. adding -Wall to CPP_WARN_FLAGS, or -fopenmp to CPP_OPENMP_FLAGS.

I enclose a patch that implements this.

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