- Added binary http headers to requests

    - Added binary http headers to requests
        - request_t objects are now created and destroyed in a consistent way
        - Fixed cache control printf bug
        - Added a lot of new http header ids
        - Improved Connection: header handling; now both Connection and
          Proxy-Connection headers are checked
        - Connection request header is now handled correctly regardless
          of its position and the number of entries
        - Better handling of persistent connection "clues" in HTTP headers
        - Removed handling of "length=" directive in IMS headers;
          the directive is not in the HTTP/1.1 standard;
          standing by for objections
        - allowed/denied headers are now checked using bit masks instead of
          strcmp loops
        - removed Uri: from allowed headers; Uri is deprecated in RFC 2068
        - removed processing of Request-Range header (no in specs?)

note: binary headers for requests are not completed:
	request_t still keeps and ascii image of the headers