Add a new experiment "altref2"
This experiment is to add ALTREF2_FRAME to allow 2 altref backward predictions. Each video frame will then have up to 7 reference frames to choose from: (1) 4 forward predictive references, namely LAST_FRAME, LAST2_FRAME, LAST3_FRAME, and GOLDEN_FRAME; and (2) 3 backward predictive references, namely BWDREF_FRAME, ALTREF2_FRAME, and ALTREF_FRAME. The tool of "altref2" is built on top of the "ext_refs" experiment. Change-Id: Idbb0bb53b43c5c2c7baf4959331fc5a31c77a118
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