New features:

 - Tom Zanussi's extended histogram work
   This adds the synthetic events to have histograms from multiple event data
   Adds triggers "onmatch" and "onmax" to call the synthetic events
   Several updates to the histogram code from this

 - Allow way to nest ring buffer calls in the same context

 - Allow absolute time stamps in ring buffer

 - Rewrite of filter code parsing based on Al Viro's suggestions

 - Setting of trace_clock to global if TSC is unstable (on boot)

 - Better OOM handling when allocating large ring buffers

 - Added initcall tracepoints (consolidated initcall_debug code with them)

And other various fixes and clean ups
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