PerfMonComps: Add some additional information to the PerfMonMTSvc output

This MR adds some useful information to the results of the PerfMonMTSvc:

• An average CPU utilization efficiency that takes into account the number of concurrent events in-flight,
• Always print the measurements for the last event that's captured,
• Include the cache size in the CPU model information,
• Include the total memory of the node in the system information,
• Include the malloc and the math libraries that were used in the processing.

Let me cc @elmsheus as he might be interested in especially the first one. See the documentation in the code that explains how it is computed.

There are also a few whitespace changes.

An example output (100 events four-thread q431 test RAWtoALL) looks like this now:

INFO =======================================================================================
INFO                                  PerfMonMTSvc Report
INFO =======================================================================================
INFO IMPORTANT : PLEASE NOTE THAT THIS SERVICE IS CURRENTLY IN R&D PHASE.
INFO             FOR FURTHER INFORMATION/QUERIES PLEASE GET IN TOUCH WITH THE SPOT TEAM.
INFO =======================================================================================
INFO *** Full set of information can also be found in: perfmonmt_RAWtoALL.json
INFO *** In order to make plots using the results run the following commands:
INFO *** $ perfmonmt-plotter.py -i perfmonmt_RAWtoALL.json
INFO *** In order to print tables using the results run the following commands:
INFO *** $ perfmonmt-printer.py -i perfmonmt_RAWtoALL.json
INFO =======================================================================================
INFO                                 Event Level Monitoring
INFO         (Only the first 10 and the last measurements are explicitly printed)
INFO =======================================================================================
INFO Event           CPU [s]     Wall [s]    Vmem [kB]   Rss [kB]    Pss [kB]    Swap [kB]
INFO ---------------------------------------------------------------------------------------
INFO 1               407.23      440.76      5491104     3916204     3913436     0   
INFO 10              478.93      467.36      8052780     6376776     6374005     0   
INFO 25              587.90      494.88      8220276     6586228     6583457     0   
INFO 50              784.53      544.71      8367900     6735968     6733196     0   
INFO 100             1218.12     654.79      8530808     6706708     6704112     0   
INFO =======================================================================================
INFO                                  Snapshots Summary
INFO =======================================================================================
INFO Step         dCPU [s]    dWall [s]   <CPU>  dVmem [kB] dRss [kB]  dPss [kB]  dSwap [kB]
INFO ---------------------------------------------------------------------------------------
INFO Configure    297.46      320.172     0.93   3216888    2201584    2198751    0   
INFO Initialize   73.33       75.455      0.97   867084     360300     360551     0   
INFO Execute      862.49      262.318     3.29   4330420    4029184    4029190    0   
INFO Finalize     15.8        15.801      1.00   0          31728      31725      0   
INFO ***************************************************************************************
INFO Number of events processed:        100 
INFO CPU usage per event [ms]:          8625
INFO Events per second:                 0.381
INFO CPU utilization efficiency [%]:    85  
INFO ***************************************************************************************
INFO Max Vmem:                          8.14 GB
INFO Max Rss:                           6.42 GB
INFO Max Pss:                           6.42 GB
INFO ***************************************************************************************
INFO Leak estimate per event Vmem:      3.92 MB
INFO Leak estimate per event Pss:       1.26 MB
INFO   >> Estimated using the last 3 measurements from the Event Level Monitoring
INFO   >> Events prior to the first 25 are omitted...
INFO =======================================================================================
INFO                                   System Information
INFO =======================================================================================
INFO CPU Model:                         Intel(R) Xeon(R) CPU E5-2667 v2 @ 3.30GHz 25600 KB
INFO Number of Available Cores:         32  
INFO Total Memory:                      31.21 GB
INFO =======================================================================================
INFO                                Environment Information
INFO =======================================================================================
INFO Malloc Library:                    libtcmalloc_minimal.so
INFO Math Library:                      libm.so.6
INFO =======================================================================================