Remove dead code.
PUBDEV-2: Fix inflate_impl for TransfVec.
Merge branch 'master' of https://github.com/0xdata/h2o-dev
PUBDEV-2: Port over more detailed Chunk tests and related fixes from PUB-841. All tests pass.
1) NewChunk atd_impl was wrong for negative exponents.
2) Slow "at()" interface was broken for constant chunks and sparse NewChunk.
3) swap _len and _len2 for NewChunk: _len is now logical (full) length, and _len2 is renamed to _sparseLen.