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The codecs are loaded at the initialization of the rtp session and destroyed at the end.
GSM audio quality is far better now. Because the dynamic library had to load at every 20ms the libgsm, it introduced a delay at each frame

Bug correction.
Remove alaw header from git repository.
Add GPL license in ulaw.cpp

!!!!!!!!!!!  Must have libspeex1 and libspeex1-dev installed

The previous commit brought a segmentation fault when launching the client.
When the daemon is lauched separatly, it uses a wrapper script, but it doesn't when the client start the daemon.
SO the LD_LIBRARY_PATH was ignored and the daemon couldn't find the dynamic library for the codecs.

Codecs dynamic libraries are created at the compilation time if they don't exist and copied in /usr/lib/sflphone/codecs at the installation

Seg fault on opening the config window