add immutable readv support to server, and to client
count vectors, try to figure out why MDMF is faster
add readv2
oops, memoryview is type, not module
better version check
interfaces
more
more
more
more
ugh copy
disable block_hash_tree and ciphertext_hash_tree fetch and check

see how this affects the speed. Also disabled readv2 (since memoryview isn't
available on my py2.6 laptop), so compare this against readv1.