PAPI defines global functions and variables without PAPI_ prefix

In its stats.c source file (which gets compiled into the thorn), PAPI defines several globally visible symbols, eg:

void outinfo(const char *const function)
...
int num_threads;

which are not prefixed with the thorn name so possibly conflict with other thorns. According to the Cactus user guide http://einsteintoolkit.org/documentation/UsersGuide/UsersGuidech9.html#x13-144000C1.9.7 users are suggested to prefix them by the thorn name (or put into a C++ namespace) to avoid conflicts.

Keyword: PAPI

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