Allow per-projection operations on tracks

Author: shahor02

DataFormats/Reconstruction/include/ReconstructionDataFormats/TrackParametrization.h

@@ -93,6 +93,11 @@ enum CovLabels : int {
   kSigQ2Pt2
 };
 
+enum TrackBits : uint8_t { // reserved track bits
+  kFirstUpdate,
+  kPerProjection
+};
+
 enum DirType : int { DirInward = -1,
                      DirAuto = 0,
                      DirOutward = 1 };
@@ -252,8 +257,10 @@ class TrackParametrization
   GPUhd() uint8_t getUserField() const;
   GPUhd() void setUserField(uint8_t v);
 
-  GPUhd() void setPerProjection(bool v) { setBit(0); }        // request perform operations per projection
-  GPUhd() bool isPerProjection() const { return testBit(0); } // perform operations per projection?
+  GPUhd() void setPerProjection(bool v) { setBit(kPerProjection); }        // request perform operations per projection
+  GPUhd() bool isPerProjection() const { return testBit(kPerProjection); } // perform operations per projection?
+  GPUhd() void setFirstUpdate(bool v) { setBit(kFirstUpdate); }            // request perform operations per projection
+  GPUhd() bool isFirstUpdate() const { return testBit(kFirstUpdate); }     // perform operations per projection?
 
   GPUd() void printParam() const;
   GPUd() void printParamHexadecimal();