- update to 1.5.1:
  * Fix free_zpage() offset accounting. The read_zpage() subtracted
    the offset from the file start to find where to get the
    compressed data, but the free_zpage() did not, and would fail to
    find and free the passed in zpage.
  * Have function_graph plugin break apart functions that migrate
    between CPUs from entry to exit even if there is no event in
    between.
  * Fix iterators for when there's CPUs with no data. It was using
    the total number of CPUs to iterate the cpu_data[] array, that
    only contains CPUs with content.
  * Fix iterator with respect to function_graph handle that may do
    a peek of the next event to know if it should merge the entry
    and exit events of a function.
  * Some other small fixes and clean ups
  * tracecmd_iterate_events_reverse(): Will iterate events in the
    trace.dat file from the last event to the first.
  * tracecmd_iterate_reset(): Reset the iterator to restart from the
    beginning.
  * Fix meson build
  * Have callbacks exit out of iterator as the man page for
    tracecmd_iterate_events() says it should.
  * Have tracecmd_iterate_events() start where it left off
  * Speed up freeing the zpages by using an rbtree instead of a flat
    link

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