* Improve robustness of sample apps. Fixing crash in aviplay
* Changes in documentation
* Add first pjsua2 hello world sample (from PJSUA2 guide)
* Fix doxygen documentation for docs.pjsip.org v2
* Add make clean-doc target
* Replace Trac ticket URL with GitHub issues URL
* Remove pjsip-book because the correct one is in pjproject_docs
- Added PCM signal adjustment in IPP G722.1 implementation. The default setting is configurable via (the existing compile-time config) PJMEDIA_G7221_DEFAULT_PCM_SHIFT.
- Added new APIs to get and set IPP codecs settings: pjmedia_codec_ipp_set/get_config(). At run-time, the G722.1 PCM signal adjustment setting can be set using these functions.
git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@3261 74dad513-b988-da41-8d7b-12977e46ad98