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add '~' as alias for '^' for fewer rc conflicts

--- a/ref.c

+++ b/ref.c

@@ -352,7 +352,7 @@

 		return -1;

 	}

 	if(readref(&h, name) == -1){

-		werrstr("could not resolve ref %s", name);

+		werrstr("invalid ref %s", name);

 		return -1;

 	}else if((o = readobject(h)) == nil){

 		werrstr("invalid ref %s (hash %H)", name, h);

@@ -364,6 +364,7 @@

 		eatspace(ev);

 		switch(ev->p[0]){

 		case '^':

+		case '~':

 			ev->p++;

 			if(parent(ev) == -1)

 				return -1;