libtracecmd: version 1.5.1

Changes since v1.5

Fixes:

 - 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
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