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