detects and uses proxies based on the environment variables. If the proxy
  was given as an explicit option it worked, but due to the setup order
  mistake proxies would not be used fine for a few protocols when picked up
  from '[protocol]_proxy'. Obviously this broke after 7.19.4. I now also added
  test case 1106 that verifies this functionality.

  (http://curl.haxx.se/bug/view.cgi?id=2913886)

server in this way, upon sysread failures, is part of the expected behavior.

signal handling to cleanup on SIGINT and SIGTERM, followup

reapply diff between revisions 1.103 and 1.102

make it more obvious how the output will be

--protocols output

protocol-specific header files

See http://curl.haxx.se/mail/lib-2009-12/0107.html

  on FTP errors in the transient 5xx range. Transient FTP errors are in the
  4xx range. The code itself only tried on 5xx errors that occured _at login_.
  Now the retry code retries on all FTP transfer failures that ended with a
  4xx response.

  (http://curl.haxx.se/bug/view.cgi?id=2911279)

  accessing alredy freed memory and thus crash when using HTTPS (with
  OpenSSL), multi interface and the CURLOPT_DEBUGFUNCTION and a certain order
  of cleaning things up. I fixed it.

  (http://curl.haxx.se/bug/view.cgi?id=2891591)

  with unknown size. Previously it was only used for posts with a known size
  larger than 1024 bytes.

  instead of being repeated several times. This also include Authenticate: and
  Proxy-Authenticate: headers and while this hardly every happens in real life
  it will confuse libcurl which does not properly support it for all headers -
  like those Authenticate headers.

Fix 'uploaded' file descriptor leak

signal handling to cleanup on SIGINT and SIGTERM

  curl_easy_setopt with CURLOPT_HTTPHEADER, the library should set
  data->state.expect100header accordingly - the current code (in 7.19.7 at
  least) doesn't handle this properly. Martin Storsjo provided the fix!

- In order to better reflect that the returned pid is extracted from the
  given file, serverpid sub is renamed to pidfromfile. In addition it is
  enhanced to make sure that it always returns zero unless a numerical
  positive value is returned.

- To better reflect that only process existance is actually checked,
  checkserver sub is renamed to processexists. In addition it is enhanced
  making it remove the given pid file when the extracted pid is no longer
  alive.

have been fixed!

- Added Diffie-Hellman parameters to several test harness certificate files in
  PEM format. Required by several stunnel versions used by our test harness.

Use different log files for each protocol

s/socklen_t/curl_socklen_t/g

Fix compiler warning: unused variable `data'