Netnode xref tags

Detailed Description

Tag values to store xrefs (see cref.cpp)

Macros
#define	NALT_CREF_TO   'X'
	code xref to, idx: target address
#define	NALT_CREF_FROM   'x'
	code xref from, idx: source address
#define	NALT_DREF_TO   'D'
	data xref to, idx: target address
#define	NALT_DREF_FROM   'd'
	data xref from, idx: source address