cmip6 - cmip6Plus table: a non bijective case

[treerink]

I encounter one case in the cmip6 - cmip6Plus conversion table and I wondered whether this is correct:

| CMIP6 table | CMIP6 variable | CMIP6Plus Table | CMIP6Plus  variable |
| LImon       | sbl            | LImon           | sbl                 |
| Amon        | sbl            | LImon           | sbl                 |

which menas two cmip6 combinations point to one cmip6Plus combination. Thus a non bijective case.

Thus just reporting, I had to filter this out in our chain based on this table.

[taylor13]

in CMIP6 these two differ in that the Amon version of sbl includes sublimation over sea ice (as well as land), so no "masking" has been applied. This probably should be put in the CMIP6Plus APmon table, but someone should confirm this.

[durack1]

@treerink you may have reported the first issue with these updated tables - thanks for checking.

The CVs Task Team (co-lead by @taylor13) is working on updates to many of these MIP components, so glad we have caught this single issue, and if you find any more, please create an additional issue so we can make sure such inconsistencies are resolved through iteration