Add ChangeLog for cam6_3_158

doc/ChangeLog

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+===============================================================
+
+Tag name: cam6_3_158
+Originator(s): cacraig
+Date: April 22, 2024
+One-line Summary: ZM clean up round 2 for CAM and cime update for GEOS-Chem
+Github PR URL: https://github.com/ESCOMP/CAM/pull/992
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+ - change zm directory to be zhang_mcfarlane:  https://github.com/ESCOMP/CAM/issues/965
+ - Reimplement writing within ZM and remove pflx variable: https://github.com/ESCOMP/CAM/issues/978
+ - ZM cleanup: https://github.com/ESCOMP/CAM/issues/984
+ - Tag cam6_3_157 missing updated .gitignore: https://github.com/ESCOMP/CAM/issues/1012
+ - GEOS-Chem compsets will fail due to bugs in CAM and CIME: https://github.com/ESCOMP/CAM/issues/1004
+
+Describe any changes made to build system: N/A
+
+Describe any changes made to the namelist: N/A
+
+List any changes to the defaults for the boundary datasets: N/A
+
+Describe any substantial timing or memory changes: N/A
+
+Code reviewed by: nusbaume
+
+List all files eliminated: N/A
+
+List all files added and what they do: N/A
+
+List all existing files that have been modified, and describe the changes:
+M       .gitignore
+          - Update FV3 listing
+
+M       externals.cfg
+          - Update cime to bring in bug fix for GEOS-Chem
+
+M       Externals_CAM.cfg
+          - Update atmospheric_physics external to bring in changes for ZM
+
+M       bld/configure
+          - Change directory from zm to zhang-mcfarlane
+
+M       src/physics/cam/cam_snapshot.F90
+M       src/physics/cam/convect_deep.F90
+M       src/physics/cam/physpkg.F90
+M       src/physics/cam_dev/cam_snapshot.F90
+M       src/physics/cam_dev/physpkg.F90
+          - Remove pflx variable which is not used
+
+M       src/physics/cam/zm_conv_intr.F90
+          - Split winds into separate variable
+	  - remove pflx
+	  - reintroduce writing within ZM
+
+If there were any failures reported from running test_driver.sh on any test
+platform, and checkin with these failures has been OK'd by the gatekeeper,
+then copy the lines from the td.*.status files for the failed tests to the
+appropriate machine below.  All failed tests must be justified.
+
+derecho/intel/aux_cam: all BFB, except:
+  ERP_Ln9.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq9s (Overall: FAIL) details:
+    - pre-existing failure
+
+  SMS_Lh12.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq3h (Overall: DIFF) details:
+    - Answer change for HEMCO - approved by Francis and Lizzie due to HEMCO giving different answers when layout changes are made
+
+  SMS_Ld1.f09_f09_mg17.FCHIST_GC.derecho_intel.cam-outfrq1d (Overall: DIFF) details:
+     - no previous baseline
+
+izumi/nag/aux_cam:
+  DAE.f45_f45_mg37.FHS94.izumi_nag.cam-dae (Overall: FAIL) details:
+     - pre-existing failure
+
+izumi/gnu/aux_cam: all BFB
+
+===============================================================
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 Tag name: cam6_3_157