Added Averager.cpp

Added a new source file named Averager.cpp which scans a number
of pulses in a branch and averages them together. The resulting
averaged pulse is then drawn to the screen.

Modified Test.cpp to now use time shift files when copying
TOFs to the output tree. If 'none' is passed as the argument
for the filename of the shift file, then the time shift is
not used.

Updated Stitcher.cpp to use the new Pixie16 data structure.
Stitcher is now able to stitch the new version of Pixie16
.root files directly.
Added DiffTime & Qcalc tools

Added two new tools named DiffTime and Qcalc.

DiffTime prints the difference between two times input from
the command line. The input and output for this program has
the format hh:mm:ss.

Qcalc calculates various beam parameters for the FN tandem
accelerator at Notre Dame. The parameters which may be
calculated are Q, Ibeam, and run time. Q is the value
from the integrator scaler. Ibeam is the beam current read
from the TwinSol FC. Run time is the length of time the
beam is run to produce the values for Q and Ibeam.
Added the RootHelper script

Added a root macro named RootHelper.cpp which is used to
make it easier to load root files and view histograms.
Added new tools to Makefile