ECC-928: Create a new MARS type Gridded Analysis Input

definitions/mars/type.table

@@ -67,3 +67,4 @@
 87 ssd Simulated satellite data
 88 gsd Gridded satellite data
 89 ga GFAS analysis
+90 gai Gridded analysis input

src/grib_accessor_class_g2_mars_labeling.c

@@ -259,6 +259,7 @@ static int extra_set(grib_accessor* a,long val)
         case 6:  /* 4d variational analysis     (4v) */
         case 7:  /* 3d variational gradients    (3g) */
         case 8:  /* 4d variational gradients    (4g) */
+        case 90: /* Gridded analysis input     (gai) */
             typeOfProcessedData=0;
             typeOfGeneratingProcess=0;
             break;