Build dirs and file of the `Flow` and save the object in pickle format.
        Returns 0 if success

        Args:
            abivalidate: If True, all the input files are validate by calling
                the abinit parser. If the validation fails, ValueError is raise.

def build_and_pickle_dump(self, abivalidate=False):
        """
        Build dirs and file of the `Flow` and save the object in pickle format.
        Returns 0 if success

        Args:
            abivalidate: If True, all the input files are validate by calling
                the abinit parser. If the validation fails, ValueError is raise.
        """
        self.build()
        if not abivalidate: return self.pickle_dump()

        # Validation with Abinit.
        isok, errors = self.abivalidate_inputs()
        if isok: return self.pickle_dump()
        errlines = []
        for i, e in enumerate(errors):
            errlines.append("[%d] %s" % (i, e))
        raise ValueError("\n".join(errlines))