another sortloot tweak - diluted potions

another sortloot tweak - diluted potions

Change sort ordering of
  diluted potion of bar
  diluted potion of foo
  potion of bar
  potion of foo
  potion of fruit juice
to
  potion of bar
  diluted potion of bar
  potion of foo
  diluted potion of foo
  potion of fruit juice
so that potions of the same type are grouped together.  Bless/curse
state (when known) takes precedence over dilution, so "blessed
diluted potion of foo" will come out before "uncursed potion foo".