missing altar drop messages

Most callers of dropx did not check for altars, but should have.  Rather
than add such checks, I moved the check from drop to dropx.  I also found
several callers of dropx that could generate out-of-order messages for some
cases (not new) and fixed them. FYI - callers of dropy don't seem to want
altar checks or already do them.

src/write.c

@@ -84,9 +84,9 @@ register struct obj *pen;
 	    You("need hands to be able to write!");
 	    return 0;
 	} else if (Glib) {
-	    dropx(pen);
 	    pline("%s from your %s.",
 		  Tobjnam(pen, "slip"), makeplural(body_part(FINGER)));
+	    dropx(pen);
 	    return 1;
 	}