speed improvement eucast_rules(), support more old MO codes

vignettes/EUCAST.Rmd

@@ -17,7 +17,7 @@ editor_options:
 ```{r setup, include = FALSE, results = 'markup'}
 knitr::opts_chunk$set(
   collapse = TRUE,
-  comment = "#>",
+  comment = "#",
   fig.width = 7.5,
   fig.height = 4.5
 )