Include PerfMon tools in AthAnalysis again

Update Projects/AthAnalysis/package_filters.txt to include PerfMon tools again. Gain in release size is about 24 MB. This addition is very useful, as it allows everybody to run PerfMon to very quickly see if there are memory leaks in the event loop. This is essential to see already before submitting large productions to the grid in order to avoid wasting lots of grid resources due to jobs crashing late in the event processing due to running out of memory.