Proper sobliv draining and many bug fixes.wip-2012.3-gpu-sobliv-budget-w-kshark

Proper sobliv draining: Always and only drain budget
from a task if its BASE priority is among the top
m processors in the cluster. This required some
work with timers and tracking of consumed budget
while a task is suspended (since the Linux rq won't
track this for us).

Had to introduce a number of hacks and kludges to
make this work in the required timeframe:
1) C-EDF's ready queue lock becomes recursive (yuck!)
2) Extend bheap with a for_each visitor function.
This is needed to set a timer for each newly released
job.
3) Dual-binary heap structure in C-EDF to divide
jobs into top-m and not-top-m tasks.
4) Restructured the budget plugin API. Unfortunatly,
there is not a lot of overlap between SIMPLE and
SOBLIV draining policies.

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