Allow Tle to be passed into constructor of SGP4

SGP4.cpp

@@ -12,6 +12,11 @@ SGP4::SGP4(void) {
     Reset();
 }
 
+SGP4::SGP4(const Tle& tle) {
+
+    SetTle(tle);
+}
+
 SGP4::~SGP4(void) {
 }
 

SGP4.h

@@ -7,6 +7,7 @@
 class SGP4 {
 public:
     SGP4(void);
+    SGP4(const Tle& tle);
     virtual ~SGP4(void);
 
     void SetTle(const Tle& tle);

SatTrack.cpp

@@ -9,8 +9,7 @@ int main() {
   Tle tle = Tle("ISS (ZARYA)             ",
     "1 25544U 98067A   11146.36888985  .00025753  00000-0  16912-3 0  4201",
     "2 25544  51.6504 272.6534 0003891 329.5510  71.2188 15.75539412717473");
-  SGP4 sgp4;
-  sgp4.SetTle(tle);
+  SGP4 sgp4(tle);
   Eci eci;
 
   while(1) {