Use 1-year file interval for global and regional stats

Creat a new global and regional stats file every year to reduce cost
of I/O. Testing in E3SM runs with active Greenland show a significant
slowdown due to I/O when the stats files get too long. 1 year is
probably shorter than necessary, but will certainly avoid the I/O
bottleneck.

Author: trhille

compass/landice/tests/ismip7_run/ismip7_ais/streams.landice.template

@@ -108,8 +108,8 @@
 
 <stream name="globalStatsOutput"
         type="output"
-        filename_template="output/globalStats.nc"
-        filename_interval="none"
+        filename_template="output/globalStats_$Y.nc"
+        filename_interval="0001-00-00_00:00:00"
         clobber_mode="overwrite"
         output_interval="0000-00-00_01:00:00"
         reference_time="2000-01-01_00:00:00"
@@ -127,8 +127,8 @@
 
 <stream name="regionalStatsOutput"
         type="output"
-        filename_template="output/regionalStats.nc"
-        filename_interval="none"
+        filename_template="output/regionalStats_$Y.nc"
+        filename_interval="0001-00-00_00:00:00"
         clobber_mode="overwrite"
         reference_time="2000-01-01_00:00:00"
         output_interval="0000-00-00_01:00:00"

compass/landice/tests/ismip7_run/ismip7_gris/streams.landice.template

@@ -97,8 +97,8 @@
 
 <stream name="globalStatsOutput"
         type="output"
-        filename_template="output/globalStats.nc"
-        filename_interval="none"
+        filename_template="output/globalStats_$Y.nc"
+        filename_interval="0001-00-00_00:00:00"
         clobber_mode="overwrite"
         output_interval="0000-00-00_01:00:00"
         reference_time="2000-01-01_00:00:00"
@@ -116,8 +116,8 @@
 
 <stream name="regionalStatsOutput"
         type="output"
-        filename_template="output/regionalStats.nc"
-        filename_interval="none"
+        filename_template="output/regionalStats_$Y.nc"
+        filename_interval="0001-00-00_00:00:00"
         clobber_mode="overwrite"
         reference_time="2000-01-01_00:00:00"
         output_interval="0000-00-00_01:00:00"