bundle: move chunk parsing into unbundle class

bundle: get rid of chunkiter

bundle: refactor progress callback This lets us eliminate the chunk iterator so we can have the bundle class parse headers.

bundle: make getchunk() a method

bundlerepo: use bundle objects everywhere

bundlerepo: drop unused close() method

bundle: make unbundle object seekable This is only for uncompressed bundles used by bundlerepo.

bundle: push chunkbuffer down into decompress We replace the fixup iterator with a file-like object so that uncompressed file streams can be passed end to end through the stack.

tests: fix a bunch of pointless #s in unified tests

tests: exit 0 no longer needed on unified tests

tests: update debugcomplete output

merge with abuehl

tests: unify some of test-mq*

subrepo: add support for 'hg archive'

subrepo: introduce files and filedata methods for subrepo classes

merge with stable