Slack time reduction

Added runtests.pl '-r' option for run time statistics

data is required in order to closer match total test execution time.

be contributing 90 additional seconds to the total time some autobuilds
now need to make a full test-run.

really didn't belong there and had no real point.

struct, and instead use the already stored string in the handler struct.

  available.

was a bit too quick and broke test case 1101 with that change. The order of
some of the setups is sensitive. I now changed it slightly again.

  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)