adds yac config

this has to be in line with the yaco config concerning time operations
and distribution of fields across yaco processes.

examples/DestinE_coupling.yml

+cat > coupling_${EXPNAME}.yaml << EOF
+definitions:
+  atm2oce: &atm2oce
+    src_component: atmo
+    src_grid: icon_atmos_grid
+    tgt_component: ocean
+    tgt_grid: icon_ocean_grid
+    src_lag: ${atm_lag}
+    tgt_lag: ${oce_lag}
+  oce2atm: &oce2atm
+    src_component: ocean
+    src_grid: icon_ocean_grid
+    tgt_component: atmo
+    tgt_grid: icon_atmos_grid
+    src_lag: ${oce_lag}
+    tgt_lag: ${atm_lag}
+  atm2yaco0: &atm2yaco0
+    src_component: atmo_output
+    src_grid: icon_atmos_grid
+    tgt_component: yaco0
+    tgt_grid: healpix_2
+    src_lag: ${atm_lag}
+    tgt_lag: ${yaco_lag}
+  atm2yaco1: &atm2yaco1
+    src_component: atmo_output
+    src_grid: icon_atmos_grid
+    tgt_component: yaco1
+    tgt_grid: healpix_2
+    src_lag: ${atm_lag}
+    tgt_lag: ${yaco_lag}
+  atm2yaco2: &atm2yaco2
+    src_component: atmo_output
+    src_grid: icon_atmos_grid
+    tgt_component: yaco2
+    tgt_grid: healpix_2
+    src_lag: ${atm_lag}
+    tgt_lag: ${yaco_lag}
+  atm2yaco3: &atm2yaco3
+    src_component: atmo_output
+    src_grid: icon_atmos_grid
+    tgt_component: yaco3
+    tgt_grid: healpix_2
+    src_lag: ${atm_lag}
+    tgt_lag: ${yaco_lag}
+  atm2yaco4: &atm2yaco4
+    src_component: atmo_output
+    src_grid: icon_atmos_grid
+    tgt_component: yaco4
+    tgt_grid: healpix_2
+    src_lag: ${atm_lag}
+    tgt_lag: ${yaco_lag}
+  oce2yaco5: &oce2yaco5
+    src_component: ocean_output
+    src_grid: icon_ocean_grid
+    tgt_component: yaco5
+    tgt_grid: healpix_2
+    src_lag: ${oce_lag}
+    tgt_lag: ${yaco_lag}
+  oce2yaco6: &oce2yaco6
+    src_component: ocean_output
+    src_grid: icon_ocean_grid
+    tgt_component: yaco6
+    tgt_grid: healpix_2
+    src_lag: ${oce_lag}
+    tgt_lag: ${yaco_lag}
+  oce2yaco7: &oce2yaco7
+    src_component: ocean_output
+    src_grid: icon_ocean_grid
+    tgt_component: yaco7
+    tgt_grid: healpix_2
+    src_lag: ${oce_lag}
+    tgt_lag: ${yaco_lag}
+
+  time_config: &time_config
+    coupling_period: ${couplingTimeStep}
+    time_reduction: average
+
+  time_config_yaco_PT1H: &time_config_yaco_PT1H
+    coupling_period: ${yaco_PT1H_CouplingTimeStep}
+    time_reduction: average
+
+  time_config_yaco_PT6H: &time_config_yaco_PT6H
+    coupling_period: ${yaco_PT6H_CouplingTimeStep}
+    time_reduction: average
+
+  time_config_yaco_P1D: &time_config_yaco_P1D
+    coupling_period: ${yaco_P1D_CouplingTimeStep}
+    time_reduction: average
+
+  interp_stacks:
+    nnn_interp_stack: &nnn_interp_stack
+      interpolation:
+        - nnn:
+            n: 1
+            weighted: arithmetic_average
+        - fixed:
+            user_value: -999.9
+    spmap_interp_stack: &spmap_interp_stack
+      interpolation:
+        - source_to_target_map:
+            weighted: arithmetic_average
+            spread_distance: 0.5
+            max_search_distance: 3.6
+
+timestep_unit: ISO_format
+calendar: proleptic-gregorian
+
+coupling:
+  - <<: [ *atm2oce, *nnn_interp_stack, *time_config ]
+    field: [surface_downward_eastward_stress,
+            surface_downward_northward_stress,
+            10m_wind_speed]
+  - <<: [ *atm2oce, *nnn_interp_stack, *time_config ]
+    field: [surface_fresh_water_flux,
+            total_heat_flux,
+            atmosphere_sea_ice_bundle]
+  - <<: [ *atm2oce, *nnn_interp_stack, *time_config ]
+    field: [sea_level_pressure] 
+  - <<: [ *oce2atm, *nnn_interp_stack, *time_config ]
+    field: [sea_surface_temperature,
+            eastward_sea_water_velocity,
+            northward_sea_water_velocity,
+            ocean_sea_ice_bundle]
+  - <<: [ *atm2oce, *spmap_interp_stack, *time_config ]
+    field: river_runoff
+  - <<: [ *atm2yaco0, *nnn_interp_stack, *time_config_yaco_PT1H ]
+    field: [ pressure_levels_u, pressure_levels_v, pressure_levels_temp ]
+  - <<: [ *atm2yaco1, *nnn_interp_stack, *time_config_yaco_PT1H ]
+    field: [ pressure_levels_hus, pressure_levels_hur, pressure_levels_clw ]
+  - <<: [ *atm2yaco2, *nnn_interp_stack, *time_config_yaco_PT1H ]
+    field: [ pressure_levels_omega, pressure_levels_gpsm ]
+  - <<: [ *atm2yaco3, *nnn_interp_stack, *time_config_yaco_PT1H ]
+    field: [ pr, tas, clt, uas, vas, dew2, hfss, hfls, clivi, cllvi, pres_sfc, pres_msl ]
+  - <<: [ *atm2yaco4, *nnn_interp_stack, *time_config_yaco_PT1H ]
+    field: [ ts_rad, prw, tauu, tauv, ts ]
+  - <<: [ *atm2yaco4, *nnn_interp_stack, *time_config_yaco_PT1H ]
+    field: [ rsds, rlds, rsns, rsnt, rlns, rlnt ]
+    scale_factor: 3600.0 # output timestep in seconds, hard coded
+  - <<: [ *oce2yaco5, *nnn_interp_stack, *time_config_yaco_PT1H ]
+    field: [ conc, hi, hs, ice_u, ice_v, mlotst, zos ]
+  - <<: [ *oce2yaco6, *nnn_interp_stack, *time_config_yaco_P1D ]
+    field: to
+    scale_summand: 273.15
+  - <<: [ *oce2yaco6, *nnn_interp_stack, *time_config_yaco_P1D ]
+    field: so
+  - <<: [ *oce2yaco7, *nnn_interp_stack, *time_config_yaco_P1D ]
+    field: [ u, v, w ]
+EOF