Merge pull request ESCOMP#322 from jedwards4b/LL_fldList

### Description of changes
Make the med_fldList fields a linked list instead of an array.   This avoids a lot of small allocations and memory fragmentation.  

### Specific notes

Contributors other than yourself, if any: Denise 

CMEPS Issues Fixed: ESCOMP#321 

Are changes expected to change answers? bfb

Any User Interface Changes (namelist or namelist defaults changes)?

### Testing performed

Testing performed if application target is CESM:
- [X] (recommended) CIME_DRIVER=nuopc scripts_regression_tests.py
   - machines: cheyenne, intel
   - details (e.g. failed tests):  all pass
- [ ] (recommended) CESM testlist_drv.xml
   - machines and compilers:
   - details (e.g. failed tests):
- [X] (optional) CESM prealpha test 
   - machines and compilers cheyenne, intel 
   - details (e.g. failed tests):  All pass except expected fails of cesm2_3_alpha10c
- [ ] (other) please described in detail
   - machines and compilers
   - details (e.g. failed tests):

Testing performed if application target is UFS-coupled:
- [X] (recommended) UFS-coupled testing
   - description: gnu and intel
   - details (e.g. failed tests):

Testing performed if application target is UFS-HAFS:
- [ ] (recommended) UFS-HAFS testing
   - description:
   - details (e.g. failed tests):

### Hashes used for testing:

- [ ] CESM:
  - repository to check out: https://github.com/ESCOMP/CESM.git
  - branch/hash:
- [ ] UFS-coupled, then umbrella repostiory to check out and associated hash:
  - repository to check out:
  - branch/hash:
- [ ] UFS-HAFS, then umbrella repostiory to check out and associated hash:
  - repository to check out:
  - branch/hash:

cesm/driver/util.F90

@@ -4,8 +4,9 @@ module util
   ! CustomFieldDictionaryProto utility module
   !-----------------------------------------------------------------------------
 
-  use ESMF
-  use NUOPC
+  use ESMF, only : ESMF_SUCCESS, ESMF_MAXSTR, ESMF_IOFmt_flag, ESMF_LogWrite
+  use ESMF, only : ESMF_LOGMSG_INFO, ESMF_LOGERR_PASSTHRU, ESMF_LOGFoundError
+  use NUOPC, only : nuopc_freeFormat, nuopc_freeformatLog, nuopc_fieldDictionaryEgest
 
   implicit none
 

cesm/nuopc_cap_share/nuopc_shr_methods.F90

@@ -149,8 +149,6 @@ subroutine set_component_logging(gcomp, mastertask, logunit, shrlogunit, rc)
 
     rc = ESMF_SUCCESS
 
-    shrlogunit = 6
-
     if (mastertask) then
        call NUOPC_CompAttributeGet(gcomp, name="diro", value=diro, rc=rc)
        if (chkerr(rc,__LINE__,u_FILE_u)) return
@@ -170,7 +168,8 @@ subroutine set_component_logging(gcomp, mastertask, logunit, shrlogunit, rc)
     else
        logUnit = 6
     endif
-    ! TODO: shr_file mod is deprecated and should be removed.
+    shrlogunit = logunit
+
     call shr_file_setLogUnit (logunit)
 
   end subroutine set_component_logging

cime_config/buildexe

@@ -111,6 +111,8 @@ def _main_func():
 
     rc, out, err = run_cmd(cmd,from_dir=bld_root)
     expect(rc==0,"Command {} failed rc={}\nout={}\nerr={}".format(cmd,rc,out,err))
+    if err:
+        logger.info(err)
     logger.info(out)
 
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