Feature/constraint analysis workshop updates

Disabling the gust and landing field length constraints caused the boundary vector to be empty, which resulted in errors. Fixed this issue

constraint_analysis/src/ca_functions.cpp

@@ -210,9 +210,7 @@ namespace Mattingly {
 
         double del = pow(c, 2.) - 4. * a * e;
 
-        V_stall = std::sqrt((-c + sqrt(del)) / (2. * a));
-        V_stall = std::sqrt((-c - sqrt(del)) / (2. * a));
-        
+        V_stall = std::max(std::sqrt((-c + sqrt(del)) / (2. * a)), std::sqrt((-c - sqrt(del)) / (2. * a)));        
 
         return pow(V_stall,2.)/(2.*weight_fraction/(atm.getDensity(altitude)*CL_max));
     }