pjsip: Group acoustic gain control analyze functions together

Ignore-this: cac9ec108b55761e72b52225fd2b7e15

darcs-hash:20130725084714-b22ec-492f671148b6fb3187d3be6d6c07c82d59eda0b4
pjsip: Adjusted acoustic gain control parameters for better results

Ignore-this: c8b76bc815d71fe2bdb40a33a1c5d72d

darcs-hash:20130725113505-b22ec-a438614ee979efa323326b5ed63d24a183fdb5bc
pjsip: Disable skewMode in echo canceller settings

Ignore-this: 84f8b741389952420282d56d6416d78b

darcs-hash:20130725121245-b22ec-333c2212b4e63dba7dd6c872154f3d0c28b01353