U319 - lotu juice

Valid fruit names like lotus would result in funny fruit juice names, eg
"lotu juice".  Looking at a long list of words ending in "us", the ones one
might reasonbly use for a fruit name were all singular, as were almost all
of the unreasonable words.  Changed the logic to prefer to leave "us" words
alone, except for 2 monster types that might be entered with "s" at the end.
Tengus is not correct, according to makeplural, but I put that in to be nice.

doc/fixes35.0

@@ -9,6 +9,7 @@ missing opthelp for use_inverse
 Never say "It moves only reluctantly"
 expert fireball/cone of cold could not target a monster seen only with
 	infravision or ESP
+display "lotus juice", not "lotu juice" for the fruit juice name
 
 
 Platform- and/or Interface-Specific Fixes