Merge pull request #637 from billsacks/add_x_comps

Add test components (X comps)

### Description of changes

Add the test components that used to be in CIME. These can be used for testing CMEPS with artificial fields. In CESM, this is done with the `X` compset. These components belong more in CMEPS than in CIME.

This brings in some, but not all history of these X components. I brought in as much history as I could fairly easily without going back to points where the history got very messy (with tons of merge commits that cluttered things up).

Note that, for `X` compsets to continue to work, this should be coordinated with the CIME changes in ESMCI/cime#4946. But it's safe for the CMEPS changes to come in before the CIME changes.

### Specific notes

Contributors other than yourself, if any:

CMEPS Issues Fixed (include github issue #):

Are changes expected to change answers? (specify if bfb, different at roundoff, more substantial) no - bfb

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

### Testing performed

`SMS_Ld2_D_P8x1.f10_g37.X.green_gnu` in cesm3_0_alpha08f with cime and cmeps updated.

Author: billsacks

med_test_comps/xatm/cime_config/buildlib

@@ -0,0 +1 @@
+../../xshare/cime_config/buildlib

med_test_comps/xatm/cime_config/buildnml

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+"""
+build data model library
+"""
+
+import sys, os
+
+_CIMEROOT = os.path.join(
+    os.path.dirname(os.path.abspath(__file__)), "..", "..", "..", "..", ".."
+)
+sys.path.append(os.path.join(_CIMEROOT, "CIME", "Tools"))
+
+from standard_script_setup import *
+from CIME.buildnml import build_xcpl_nml, parse_input
+from CIME.case import Case
+
+
+def buildnml(case, caseroot, compname):
+    if compname != "xatm":
+        raise AttributeError
+    build_xcpl_nml(case, caseroot, compname)
+
+
+def _main_func():
+    caseroot = parse_input(sys.argv)
+    with Case(caseroot) as case:
+        buildnml(case, caseroot, "xatm")
+
+
+if __name__ == "__main__":
+    _main_func()

med_test_comps/xatm/cime_config/config_component.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0"?>
+
+<?xml-stylesheet type="text/xsl" href="entry_id.xsl" ?>
+
+<entry_id version="3.0">
+  <description>
+    <desc atm="XATM">Dead atm component</desc>
+  </description>
+
+  <entry id="COMP_ATM">
+    <type>char</type>
+    <valid_values>xatm</valid_values>
+    <default_value>xatm</default_value>
+    <group>case_comp</group>
+    <file>env_case.xml</file>
+    <desc>Name of atmosphere component</desc>
+  </entry>
+
+  <help>
+    =========================================
+    XATM naming conventions in compset name
+    =========================================
+  </help>
+
+</entry_id>

med_test_comps/xatm/src/atm_comp_nuopc.F90

@@ -0,0 +1 @@
+../../xshare/cime_config/buildlib

med_test_comps/xglc/cime_config/buildlib

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+"""
+build data model library
+"""
+
+import sys, os
+
+_CIMEROOT = os.path.join(
+    os.path.dirname(os.path.abspath(__file__)), "..", "..", "..", "..", ".."
+)
+sys.path.append(os.path.join(_CIMEROOT, "CIME", "Tools"))
+
+from standard_script_setup import *
+from CIME.buildnml import build_xcpl_nml, parse_input
+from CIME.case import Case
+
+
+def buildnml(case, caseroot, compname):
+    if compname != "xglc":
+        raise AttributeError
+    build_xcpl_nml(case, caseroot, compname)
+
+
+def _main_func():
+    caseroot = parse_input(sys.argv)
+    with Case(caseroot) as case:
+        buildnml(case, caseroot, "xglc")
+
+
+if __name__ == "__main__":
+    _main_func()

med_test_comps/xglc/cime_config/buildnml

@@ -0,0 +1,26 @@
+<?xml version="1.0"?>
+
+<?xml-stylesheet type="text/xsl" href="entry_id.xsl" ?>
+
+<entry_id version="3.0">
+  <description>
+    <desc glc="XGLC">Dead land-ice component</desc>
+  </description>
+
+  <entry id="COMP_GLC">
+    <type>char</type>
+    <valid_values>xglc</valid_values>
+    <default_value>xglc</default_value>
+    <group>case_comp</group>
+    <file>env_case.xml</file>
+    <desc>Name of land-ice component</desc>
+  </entry>
+
+
+  <help>
+    =========================================
+    XGLC naming conventions in compset name
+    =========================================
+  </help>
+
+</entry_id>