Remove leading 0 from post task dependencies (#283)

* Changes to post file names to make model lowercase and move ${fhr} to three values instead of two

* Change "rrfs" to "${NET}" instead

* Add missing "f" to file name

* Remove restriction on ${fhr} being only two digits

* Change fhour to three digit variable and at "f" to filename for Python plotting script.

* Add new "post_fhr" variable to support dynamic 2- and 3-digit forecast hour formats in post filenames

* Use "print_err_msg_exit" if forecast hour length is too long or short.

* Fix indentations

* Remove 0 from dynf0#fhr# and phyf0#fhr# dependencies for post task in XML template

ush/templates/FV3LAM_wflow.xml

@@ -399,8 +399,8 @@ MODULES_RUN_TASK_FP script.
         <or>
           <taskdep task="&RUN_FCST_TN;"/>
           <and>
-            <datadep age="05:00"><cyclestr>&CYCLE_BASEDIR;/@Y@m@d@H{{ slash_ensmem_subdir }}/dynf0#fhr#.nc</cyclestr></datadep>
-            <datadep age="05:00"><cyclestr>&CYCLE_BASEDIR;/@Y@m@d@H{{ slash_ensmem_subdir }}/phyf0#fhr#.nc</cyclestr></datadep>
+            <datadep age="05:00"><cyclestr>&CYCLE_BASEDIR;/@Y@m@d@H{{ slash_ensmem_subdir }}/dynf#fhr#.nc</cyclestr></datadep>
+            <datadep age="05:00"><cyclestr>&CYCLE_BASEDIR;/@Y@m@d@H{{ slash_ensmem_subdir }}/phyf#fhr#.nc</cyclestr></datadep>
           </and>
         </or>
       </dependency>