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Reply 489 Bad Event if we receive a NOTIFY in a call for anything else than a "refer" event package. This commit is also made in master branch.

Relax assertion of measurement of call duration, because getting the two Released state can take up to one seconds on some platforms, probably a lot of time is wasted in shutting down the audio stream.

This reverts commit 131201a7.

This commit was intended to remove deprecation warnings. That would have been great if it was specified in the original commit message...

Reimplement ip version selection for outgoing calls. This corresponds to commits 3fd706a7 and 08a66cdf of master branch.

+ Merging of ENABLE_SPHINX_DOC and ENABLE_DOC options. Only ENABLE_DOC remains.
+ Switching default value of ENABLE_DOC option to NO.
+ Adding tests for checking the presence of Python modules needed
  for documentation and wrappers generation.