Remove mct for cesm

[jedwards4b]

mct library is no longer needed for cesm.

Test suite:
Test baseline:
Test namelist changes:
Test status: [bit for bit, roundoff, climate changing]

Fixes [CIME Github issue #]

User interface changes?:

Update gh-pages html (Y/N)?:

[jgfouca]

This makes me a little nervous due to the path changes, but I can fix up any impacts to CMake.

[rljacob]

This makes me a little...wistful. But E3SM will be doing this eventually.

[brian-eaton]

@rljacob, me too:) Thanks for the good work on MCT which got the job done for many years. It was a rock solid lightweight coupling toolkit!

[jedwards4b]

@jasonb5 I would like the entrypoint.sh for cesm to look like this:

    echo "Setting up CESM"                                                                                                                                                                                      
                                                                                                                                                                                                                
    [[ ! -e "${SRC_PATH}/CESM" ]] && git clone -b ${CESM_BRANCH:-master} ${GIT_FLAGS} ${E3SM_REPO:-https://github.com/ESCOMP/CESM} "${SRC_PATH}/CESM"                                                           
                                                                                                                                                                                                                
    pushd "${SRC_PATH}/CESM"                                                                                                                                                                                    
                                                                                                                                                                                                                
    git config --global --add safe.directory "*"                                                                                                                                                                
                                                                                                                                                                                                                
    ./bin/git-fleximod update                                                                                                                                                                                   
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
    git status                                                                                                                                                                                                  
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
    pushd cime                                                                                                                                                                                                  
  # here we should update cime to the branch we want to test?                                                                                                                                                                                                                                                                                                                                                                           
                                                                                                                                                                                                                                                                                                                       
    # link v3 config_machines                                                                                                                                                                                   
    ln -sf /root/.cime/config_machines.v3.xml /root/.cime/config_machines.xml                      

[jasonb5]

@jedwards4b I believe the remaining failures are due to cmeps and csm_share submodules needing to be updated.

[jedwards4b]

Is it okay to merge then? Thank you so much for your help.

[jasonb5]

@jedwards4b Yea it should be fine to merge.

[jedwards4b]

Updated latest cime tag to be cime6.1.0