Added option to use TIGRESS positions

Added code to use TIGRESS detector positions rather than GRIFFIN. Use
this command BEFORE using the "add GRIFFIN detector" commands.
/DetSys/det/UseTIGRESSPositions true
Added "stepTracker" output

This new functionality outputs step information (event#, step#, det#,
cry#, pos, etc) to a root tuple tree. To activate this code set
stepTrackerBool = true; at the top of EventAction.cc. It is currently
set to false because outputting all this information is computationally
expensive. We don't want to do it unless we need it.
Merge pull request #44 from evan012345/master

TIGRESS positions and "stepTracker"
Fixed bug

bug
Another fix

bug
Last fix

more bugs
Merge pull request #48 from evan012345/master

Got rid of bugs. Should work now
fix SetDetNumberForGenericDetector

Things like sceptar should fill normally if it is added after GRIFFIN
Merge pull request #50 from evan012345/master

fix SetDetNumberForGenericDetector
modified DetectionSystemPaces
Merge pull request #51 from zmwang5/master

modified DetectionSystemPaces
Cleaned up code
Merge remote branch 'upstream/master'
Update DetectionSystemPaces.cc

The PCAES color code is a bit confusing, so I changed "canister" color to cyan, "aluminum_annulus_bot and _top" to the same as aluminum hemisphere.
Merge pull request #52 from zmwang5/patch-2

Update DetectionSystemPaces.cc
Adding histograms for paces
Merge remote branch 'upstream/master'
Added histogram output for PACES
Tidied up some of DetectionSystemPaces
Merge pull request #53 from tballast/master

Addes Histogram Output for PACES