add list_move_tail to u_double_list.h
perfkit is on the way my friend

perfkit again
add some debug messages in the HUD and in the nvc0 query hooks
gallium: add PIPE_CAP_MAX_ACTIVE_COUNTERS

This defines the maximum number of active counters per domain
supported by the hardware.

TODO: Define it for all drivers!

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>