Enable ec_adapt by default and fix experiment compatibilities.

EXT_TILE: allocate variables on the heap due to the potentially
large number of tiles.

ANS: initialise tile contexts.

EXT_INTER, MOTION_VAR, WARPED_MOTION: fix compilation.

Change-Id: I43a9d01c2442d97b6a8875712f77d932dce3740d
7 files changed