Added LazyZip and LazyEnumerate to help with making nltk.evaluate.accuracy a little more memory friendly.
Added LazyZip and LazyEnumerate to help with making nltk.evaluate.accuracy
a little more memory friendly.

Deprecated LazyMappedChain which can be replaced by
LazyConcatenation(LazyMap(...)).


svn/trunk@6309

nltk/nltk,nltk/nltk,nltk/nltk