Memory leak when tracking performance

[abumq]

There is a memory leak when tracking performance, this comes from END_FUNC that re-initialte all the streams to write function performance summary to logs.

Proof

sh build_all.sh && valgrind ./bin/time_tracker.cpp.bin
==19585== Memcheck, a memory error detector
==19585== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==19585== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==19585== Command: ./bin/time_tracker.cpp.bin
==19585== 
[INFO] [26/01/2013 11:38:10.975] Result is 3
==19585== 
==19585== HEAP SUMMARY:
==19585==     in use at exit: 1,417 bytes in 3 blocks
==19585==   total heap usage: 131 allocs, 128 frees, 55,029 bytes allocated
==19585== 
==19585== LEAK SUMMARY:
==19585==    definitely lost: 0 bytes in 0 blocks
==19585==    indirectly lost: 0 bytes in 0 blocks
==19585==      possibly lost: 537 bytes in 1 blocks
==19585==    still reachable: 880 bytes in 2 blocks
==19585==         suppressed: 0 bytes in 0 blocks
==19585== Rerun with --leak-check=full to see details of leaked memory
==19585== 
==19585== For counts of detected and suppressed errors, rerun with: -v
==19585== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)