perf/urgent fixes:

Fixes for 'perf sched timehist': (Namhyung Kim)

- Define a larger initial alignment value for the COMM column and
  make it be more consistently honoured, for instance in the header.

- Fix invalid period calculation when using the --time option to
  select a time slice, when events outside that slice were being
  considered for the per cpu idle stats summary.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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