Update to 4.1.1.

This is a security release addressing CVE-2016-2851.

- Fix an integer overflow bug that can cause a heap buffer overflow (and
  from there remote code execution) on 64-bit platforms
- Fix possible free() of an uninitialized pointer
- Be stricter about parsing v3 fragments
- Add a testsuite ("make check" to run it), but only on Linux for now,
  since it uses Linux-specific features such as epoll
- Fix a memory leak when reading a malformed instance tag file
- Protocol documentation clarifications

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