Update aliases so that they apply properly to profile names.

Instead of updating the profile name, allow a profile to have multiple
alternate names.  Aliases are now added as alternate names and matched
through the xmatch dfa.

parser/parser.h

@@ -77,9 +77,15 @@ struct aa_rlimits {
 	rlim_t limits[RLIMIT_NLIMITS];
 };
 
+struct alt_name {
+	char *name;
+	struct alt_name *next;
+};
+
 struct codomain {
 	char *namespace;
 	char *name;				/* codomain name */
+	struct alt_name *altnames;
 	void *xmatch;
 	size_t xmatch_size;
 	int xmatch_len;