Add doxygen comments to * PAPI_list_threads() * PAPI_lock() * PAPI_multiplex_init() * PAPI_num_hwctrs() * PAPI_num_cmp_hwctrs()
Add doxygen comments to
* PAPI_list_threads()
* PAPI_lock()
* PAPI_multiplex_init()
* PAPI_num_hwctrs()
* PAPI_num_cmp_hwctrs()

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