Disambiguate binary operators of CLN types with float/double

	Disambiguate binary operators of CLN types with float/double
	* include/cln/dfloat.h: Add binary operator overloads for arguments of
	type double.
	* include/cln/ffloat.h: Likewise, for arguments of type float.
	* include/cln/float.h: Likewise, both for arguments of types double and
	float.
	* include/cln/real.h: Likewise.
	Reported by Isidro Cachadiña Gutiérrez <icacha@unex.es>.
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include/cln/dfloat.h include/cln/ffloat.h CVS: include/cln/float.h
include/cln/real.h CVS:
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