fixed: missing AB1 support

Apps/Common/TimeIntUtils.C

@@ -35,6 +35,8 @@ TimeIntegration::Method TimeIntegration::get (const std::string& type)
     return RK3;
   else if (type == "rk4")
     return RK4;
+  else if (type == "ab1")
+    return AB1;
   else if (type == "ab2")
     return AB2;
   else if (type == "ab3")
@@ -51,6 +53,7 @@ TimeIntegration::Method TimeIntegration::get (const std::string& type)
 int TimeIntegration::Order (Method method)
 {
   switch (method) {
+  case AB1:
   case EULER:
   case BE:
     return 1;

Apps/Common/TimeIntUtils.h

@@ -33,6 +33,7 @@ namespace TimeIntegration
     HEUN,  //!< Heun-Euler, explicit
     RK3,   //!< Kutta's third order method, explicit
     RK4,   //!< Kutta's fourth order method, explicit
+    AB1,   //!< First order Adams-Bashforth, explicit
     AB2,   //!< Second order Adams-Bashforth, explicit
     AB3,   //!< Third order Adams-Bashforth, explicit
     AB4,   //!< Fourth order Adams-Bashforth, explicit