Added test to read Gaussian reduced grids.

test/Read_grib.test.in

 #! @SHELL@
-echo 1..4 # Number of tests to be executed.
+echo 1..6 # Number of tests to be executed.
 #
 test -n "$CDO"      || CDO=cdo
 test -n "$DATAPATH" || DATAPATH=./data
@@ -10,7 +10,7 @@ CDOERR=cerr$$
 NTEST=1
 #
 for OPERATOR in sinfo info; do
-  for FILE in testfile01 testfile02; do
+  for FILE in testfile01 testfile02 testfile03; do
     RSTAT=0
     IFILE=$DATAPATH/grib_${FILE}.grb
     OFILE=grib_${FILE}_${OPERATOR}

test/data/Makefile.am

 INPUTDATA = ts_mm_5years hl_l19.grb t21_geosp_tsurf.grb bathy4.grb pl_data pl_data.grb detrend_data \
-            grib_testfile01.grb grib_testfile02.grb netcdf_testfile01.nc netcdf_testfile02.nc testfile01c.nc \
+            grib_testfile01.grb grib_testfile02.grb grib_testfile03.grb netcdf_testfile01.nc netcdf_testfile02.nc testfile01c.nc \
             datar.nc datac.nc datau.nc datag.nc
 
 FILE_REF     = file_F32_srv_ref
-GRIB_REF     = grib_testfile01_sinfo_ref grib_testfile01_info_ref grib_testfile02_sinfo_ref grib_testfile02_info_ref
+GRIB_REF     = grib_testfile01_sinfo_ref grib_testfile01_info_ref grib_testfile02_sinfo_ref grib_testfile02_info_ref grib_testfile03_sinfo_ref grib_testfile03_info_ref
 NETCDF_REF   = netcdf_testfile01_sinfon_ref netcdf_testfile01_infon_ref netcdf_testfile02_sinfon_ref netcdf_testfile02_infon_ref
 YMONSTAT_REF = ymonmin_ref ymonmax_ref ymonsum_ref ymonavg_ref ymonmean_ref ymonstd_ref ymonstd1_ref ymonvar_ref ymonvar1_ref
 TIMSTAT_REF  = timmin_ref timmax_ref timsum_ref timavg_ref timmean_ref timstd_ref timstd1_ref timvar_ref timvar1_ref

test/data/Makefile.in

@@ -286,11 +286,11 @@ top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 INPUTDATA = ts_mm_5years hl_l19.grb t21_geosp_tsurf.grb bathy4.grb pl_data pl_data.grb detrend_data \
-            grib_testfile01.grb grib_testfile02.grb netcdf_testfile01.nc netcdf_testfile02.nc testfile01c.nc \
+            grib_testfile01.grb grib_testfile02.grb grib_testfile03.grb netcdf_testfile01.nc netcdf_testfile02.nc testfile01c.nc \
             datar.nc datac.nc datau.nc datag.nc
 
 FILE_REF = file_F32_srv_ref
-GRIB_REF = grib_testfile01_sinfo_ref grib_testfile01_info_ref grib_testfile02_sinfo_ref grib_testfile02_info_ref
+GRIB_REF = grib_testfile01_sinfo_ref grib_testfile01_info_ref grib_testfile02_sinfo_ref grib_testfile02_info_ref grib_testfile03_sinfo_ref grib_testfile03_info_ref
 NETCDF_REF = netcdf_testfile01_sinfon_ref netcdf_testfile01_infon_ref netcdf_testfile02_sinfon_ref netcdf_testfile02_infon_ref
 YMONSTAT_REF = ymonmin_ref ymonmax_ref ymonsum_ref ymonavg_ref ymonmean_ref ymonstd_ref ymonstd1_ref ymonvar_ref ymonvar1_ref
 TIMSTAT_REF = timmin_ref timmax_ref timsum_ref timavg_ref timmean_ref timstd_ref timstd1_ref timvar_ref timvar1_ref

test/data/grib_testfile03_info_ref

+    -1 :       Date     Time   Level Gridsize    Miss :     Minimum        Mean     Maximum : Parameter ID
+     1 : 1958-09-01 00:00:00       0    35718       0 :      94858.  1.0104e+05  1.0374e+05 : 151.128       

test/data/grib_testfile03_sinfo_ref

+   File format : GRIB
+    -1 : Institut Source   Steptype Levels Num    Points Num Dtype : Parameter ID
+     1 : ECMWF    unknown  instant       1   1     35718   1  P16  : 151.128       
+   Grid coordinates :
+     1 : gaussian reduced         : points=35718  nlat=160  np=80
+                              lat : 89.1415 to -89.1415 degrees_north
+   Vertical coordinates :
+     1 : surface                  : levels=1
+   Time coordinate :  1 step
+     RefTime =  1958-09-01 00:00:00  Units = hours  Calendar = proleptic_gregorian
+  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss
+  1958-09-01 00:00:00