Added new symba_system_snapshot object to track the system through en…

…counters

src/encounter/encounter_io.f90

@@ -140,7 +140,7 @@ module subroutine encounter_io_write_frame(self, nciu, param)
       implicit none
       ! Arguments
       class(encounter_list),          intent(in)    :: self   !! Swiftest encounter structure
-      class(encounter_io_parameters), intent(inout) :: nciu     !! Parameters used to identify a particular encounter io NetCDF dataset
+      class(encounter_io_parameters), intent(inout) :: nciu   !! Parameters used to identify a particular encounter io NetCDF dataset
       class(swiftest_parameters),     intent(inout) :: param  !! Current run configuration parameters
       ! Internals
       integer(I4B)                             :: tslot,i,old_mode, n

src/modules/symba_classes.f90

@@ -201,7 +201,14 @@ module symba_classes
       final     :: symba_util_final_system                                !! Finalizes the SyMBA nbody system object - deallocates all allocatables
    end type symba_nbody_system
 
+   type, extends(helio_nbody_system) :: symba_system_snapshot
+   contains
+      procedure :: snapshot => symba_util_take_system_snapshot
+      final :: symba_util_final_snapshot
+   end type 
+
    interface
+
       module function symba_collision_check_encounter(self, system, param, t, dt, irec) result(lany_collision)
          use swiftest_classes, only : swiftest_parameters
          implicit none
@@ -374,6 +381,15 @@ module subroutine symba_util_set_renc(self, scale)
          integer(I4B),    intent(in)    :: scale !! Current recursion depth
       end subroutine symba_util_set_renc
 
+      module subroutine symba_util_take_system_snapshot(self, system, param, t)
+         use swiftest_classes, only : swiftest_parameters
+         implicit none
+         class(symba_system_snapshot), intent(inout) :: self   !! SyMBA nbody system snapshot object
+         class(symba_nbody_system),       intent(in)    :: system !! SyMBA nbody system object
+         class(symba_parameters),         intent(in)    :: param  !! Current run configuration parameters 
+         real(DP),                        intent(in)    :: t      !! current time
+      end subroutine symba_util_take_system_snapshot
+
       module subroutine symba_io_param_reader(self, unit, iotype, v_list, iostat, iomsg) 
          implicit none
          class(symba_parameters), intent(inout) :: self       !! Current run configuration parameters with SyMBA additionss
@@ -648,6 +664,11 @@ module subroutine symba_util_final_pl(self)
          type(symba_pl),  intent(inout) :: self !! SyMBA massive body object
       end subroutine symba_util_final_pl
 
+      module subroutine symba_util_final_snapshot(self)
+         implicit none
+         type(symba_system_snapshot),  intent(inout) :: self !! SyMBA nbody system object
+      end subroutine symba_util_final_snapshot
+
       module subroutine symba_util_final_system(self)
          implicit none
          type(symba_nbody_system),  intent(inout) :: self !! SyMBA nbody system object