Sorry guys I know we're trying to get 1.3b4 rolled, but I really really

really want chunking to work since it is affecting the deployment of
HTTP/1.1.  I've stressed this patch a fair amount with a module I'll
check in shortly.

Two more chunking bugs:

- start_chunk() called bflush() called start_chunk() caused chaos
- if we ended up in the tail of bwrite() where a memcpy happens to copy
    the remainder, in certain boundary cases with chunking we would
    go past the end of the buffer

Just generally clean up chunking a bit.  This would be a lot easier if
chunking were just a layered I/O handler.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80150 13f79535-47bb-0310-9956-ffa450edef68