Update with acceptance test for both STDEV and PERCENTILE function

Update with acceptance test for both STDEV and PERCENTILE function

tests_acceptance/input_yaml_files/test7c_time_aggregation_standarddeviation_percentiles.yaml

@@ -0,0 +1,88 @@
+version: 0.0.0
+
+input-data:
+  - dataset:
+      filename: ./tests_acceptance/input_nc_files/small_subset_FM-VZM_0000_map.nc
+      variable_mapping:
+       salinity_PSU: salinity_PHU
+
+rules:
+
+   # Get top layer salinity
+  - layer_filter_rule:
+      name: Get top layer
+      description: get top layer of model
+      layer_number: 22
+      input_variable: salinity_PHU
+      output_variable: salinity_top_layer
+
+# Apply ZES.1 classification rules
+   # Determine ZES.1 SaltClass
+  - time_aggregation_rule:
+      name: Mean salinity
+      description: Get mean salinity
+      operation: AVERAGE
+      time_scale: year
+      input_variable: salinity_top_layer
+      output_variable: mean_salinity_PSU
+
+  - step_function_rule:
+      name: Mean salinity class
+      description: Apply a salinity class from mean salinity
+      limit_response_table:
+            - [ limit , response]
+            - [-999.0 , 0.0     ]
+            - [   0.5 , 1.0     ]
+            - [  18.0 , 2.0     ]
+            - [ 999.0 , 2.0     ]
+      input_variable: mean_salinity_PSU
+      output_variable: SaltClass
+
+   # Determine ZES.1 SaltVarib
+  - time_aggregation_rule:
+      name: Standard deviation salinity
+      description: Get standard deviation of salinity
+      operation: STDEV    
+      time_scale: year
+      input_variable: salinity_top_layer
+      output_variable: std_salinity_PSU
+
+  - formula_rule:
+      name: Compute variability in PSU
+      description: Find when cell is flooded
+      formula: std_salinity_PSU / mean_salinity_PSU
+      input_variables:  [std_salinity_PSU, mean_salinity_PSU]     
+      output_variable: salinity_variability
+
+  - step_function_rule:
+      name: Salinity variability class
+      description: Salinity variability class
+      limit_response_table:
+            - [ limit , response]
+            - [-999.0 , 0.0     ]
+            - [   0.25, 1.0     ]
+            - [ 999.0 , 1.0     ]
+      input_variable: mean_salinity_PSU
+      output_variable: SaltVarib
+
+#Test precentiles
+  - time_aggregation_rule:
+      name: PERC10 salinity
+      description: Get percentile 10 of salinity
+      operation: PERCENTILE(10)
+      time_scale: year
+      input_variable: salinity_top_layer
+      output_variable: perc10_salinity_PSU
+
+  - time_aggregation_rule:
+      name: PERC90 salinity
+      description: Get percentile 90 of salinity
+      operation: PERCENTILE(90)
+      time_scale: year
+      input_variable: salinity_top_layer
+      output_variable: perc90_salinity_PSU
+
+
+
+output-data:
+  filename: ./tests_acceptance/output_nc_files/test7c_time_aggregation_standarddeviation_percentiles.nc