patch applied (packages/base): New function isInfixOf that searches a list for a given sublist

[Ian Lynagh]

Thu Aug 31 08:15:56 PDT 2006  John Goerzen <jgoerzen at complete.org>
  * New function isInfixOf that searches a list for a given sublist
  
  Example:
  
  isInfixOf "Haskell" "I really like Haskell." -> True
  isInfixOf "Ial" "I really like Haskell." -> False
  
  This function was first implemented in MissingH as MissingH.List.contains

    M ./Data/List.hs +12