Replace eccentricity calculations

Eccentricity calculations switch from using the legacy system
code to using the modern C++ code for orbital parameters.

Author: heshpdx

aircraft/J246/Systems/J246GuidanceExecutive.xml

@@ -220,13 +220,7 @@
       <function>
         <quotient>
           <difference>
-            <product>
-              <property>guidance/executive/semimajor-axis-length-ft</property>
-              <sum>
-                <value>1</value>
-                <property>orbital/eccentricity</property>
-              </sum>
-            </product>
+            <property>orbital/apoapsis-radius-ft</property>
             <property>inertial/sea-level-radius_ft</property>
           </difference>
           <value>5280</value>
@@ -238,13 +232,7 @@
       <function>
         <quotient>
           <difference>
-            <product>
-              <property>guidance/executive/semimajor-axis-length-ft</property>
-              <difference>
-                <value>1</value>
-                <property>orbital/eccentricity</property>
-              </difference>
-            </product>
+            <property>orbital/periapsis-radius-ft</property>
             <property>inertial/sea-level-radius_ft</property>
           </difference>
           <value>5280</value>

scripts/J2460.xml

@@ -26,7 +26,7 @@
         <property caption="ECI Velocity (fps):      "> velocities/eci-velocity-mag-fps </property>
         <property caption="Orbital apogee (miles):  "> guidance/executive/apoapsis </property>
         <property caption="Orbital perigee (miles): "> guidance/executive/periapsis </property>
-        <property caption="Orbital eccentricity:    "> guidance/executive/eccentricity </property>
+        <property caption="Orbital eccentricity:    "> orbital/eccentricity </property>
         <property caption="Altitude AGL (ft):       "> position/h-agl-ft </property>
         <property caption="Alpha (deg):             "> aero/alpha-deg </property>
         <property caption="Pitch rate cmd:          "> guidance/executive/gravity-turn-pitch-rate-command </property>

scripts/J2461.xml

@@ -107,7 +107,7 @@
         <property caption="ECI Velocity (fps):      "> velocities/eci-velocity-mag-fps </property>
         <property caption="Orbital apogee (miles):  "> guidance/executive/apoapsis </property>
         <property caption="Orbital perigee (miles): "> guidance/executive/periapsis </property>
-        <property caption="Orbital eccentricity:    "> guidance/executive/eccentricity </property>
+        <property caption="Orbital eccentricity:    "> orbital/eccentricity </property>
         <property caption="Altitude AGL (ft):       "> position/h-agl-ft </property>
         <property caption="Alpha (deg):             "> aero/alpha-deg </property>
         <property caption="Pitch rate cmd:          "> guidance/executive/gravity-turn-pitch-rate-command </property>