Merge branch 'fixes-for-new-overloading-checks' into 'master'

Fixes for changes to the overloading system

See merge request !295

src/libraries/OS-Independent/Data/NGramIndex.icl

@@ -6,7 +6,7 @@ from StdFunc import flip, o
 import StdInt
 from StdList import filter, flatten, isMember, map, removeDup, span, take, ++,
 	instance length [], instance == [a], instance < [a],
-	instance fromString [Char], instance toString [Char], foldr
+	instance fromString [a], instance toString [a], foldr
 import StdOrdList
 import StdString