issue #285 adding new Code Table 4.253

GRIB2_CodeFlag_4_253_CodeTable_en.csv

@@ -0,0 +1,5 @@
+Title_en,SubTitle_en,CodeFlag,Value,MeaningParameterDescription_en,Note_en,noteIDs,UnitComments_en,Status
+Hazard index,,0,,Undefined,,,,Operational
+Hazard index,,1-191,,Reserved,(see Note),285a,,Operational
+Hazard index,,192-254,,Reserved for local use,,,,Operational
+Hazard index,,65535,,Missing,,,,Operational

notes/CodeFlag_notes.csv

@@ -159,4 +159,5 @@ noteID,note
 162,"Ben Bouallègue, Z. (2021). On the verification of the crossing-point forecast. Tellus A: Dynamic Meteorology and Oceanography, 73(1), 1–10. [https://doi.org/10.1080/16000870.2021.1913007]"
 163,In relation to local coordinate axes at a (grid) cell edge.
 164,"When using entry 10, the lower limit is used to encode the quantile q (must be an integer between 0 and Q) while the upper limit is used to encode the total number of quantiles Q. This defines the probability of the parameter falling within quantile q. For instance, to encode the probability of falling within the 10th percentile, then q=10 and Q=100; to encode the probability of falling within the 1st tercile, then q=1 and Q=3."
-165,"Model physics are perturbed (for example, with methods like SPPT, SPP and SKEB."
+165,"Model physics are perturbed (for example, with methods like SPPT, SPP and SKEB."
+285a,"The hazard index can be locally defined by the centre."