Count overruns when profiling; change units to ns.
* lisp/profiler.el (profiler-sampling-interval): Change units from ms to ns, multiplying the default by 1000000 so that it remains 1 ms. (profiler-report-cpu-line-format): Give enough room for the maximum counters on 64-bit hosts. (profiler-report-render-calltree-1): Call them "CPU samples", not "Time (ms)", since they are not milliseconds now (and never really were). * src/profiler.c (handle_profiler_signal): Count sampling intervals, not ms. Give extra weight to samples after overruns, to attempt to count the time more accurately. (setup_cpu_timer): Change sampling interval units from ms to ns, since the underlying primitives nominally do ns. (Fprofiler_cpu_start): Document the change. Mention that the sampling intervals are only approximate.
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