Author: Henrik Nordstrom <henrik@henriknordstrom.net>

Author: Henrik Nordstrom <henrik@henriknordstrom.net>
Simplify request parsing to not check request method when determining entities

Requests containing a request-entity or not is signalled entirely by
Content-Length/Transfer-Encoding regardless of method.

Also drops the requirement that PUT/POST requests must have a request-entity.
The RFC do not explicitly state this requirement even if the wording for those
methods do assume there is a enclosed request-entity.

The administrative "request_entities" config flag is kept for security
reasons, even if not really RFC compliant. (RFC meaning of request-entity
in GET/HEAD is just undefined or "ignored", not forbidden)