* Moved DoutCurlEasy and DoutCurlEasyEntering from aicurl.cpp
to aicurl.h and renamed them to DoutCurl and DoutCurlEntering
respectively.
* Moved the callback functions from aicurl.cpp to aicurlthread.cpp.
* In CurlEasyRequest, renamed timeout_timings to print_curl_timings
and mTimeoutLowercaseHostname to mLowercaseHostname.
* Put all remaining CurlEasyRequest::mTimeout* variables and
timeout_* methods in curlthread::HTTPTimeout, stripping them
of said prefix, and moved the definition to aicurlprivate.h.
Added a ThreadSafeCurlEasyRequest* member and a get_lockobj()
method so to that class so we can still use DoutCurl /
DoutCurlEntering. timeout_add_easy_request was removed completely
and reimplemented as the constructor of HTTPTimeout.
timeout_has_stalled was renamed to HTTPTimeout::has_stalled,
but also reimplemented as CurlEasyRequest::has_stalled.
* CurlEasyRequest::mRequestFinalized was removed and it's
functionality taken over by CurlEasyRequest::mTimeoutPolicy.
* Fixed the indentation of struct Stats, class CurlEasyHandle
and class CurlEasyRequest.
* Added CurlEasyRequest::set_timeout_opts
* Added CurlSocketInfo::mTimeout (LLPointer<HTTPTimeout>).
* mUploadFinished is now reset in HTTPTimeout::data_received,
this was needed because "HEAD /something" header-only
messages triggered upload_finished (unlike "GET ..."),
and in combination with redirection that caused an assert.
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