wrong oasis partition indexes with halos in cpl_define routine

[gsamson]

Context

Oasis partition definition in cpl_define routine needs to be updated to handle halos correctly

Analysis

When trying to use SAS in coupled mode with OASIS, OASIS complains because of dimensions mismatch between grids definition and restart file dimensions. This is because "paral" values (NEMO lower left corner global offset, global extent in x and domain size) are not correctly defined to handle correctly halos.

Fix

After discussion with Seb, he proposes to replace:

• paral(2) = jpiglo * (Njs0-1+njmpp-1) + (Nis0-1+nimpp-1) with:
• paral(2) = Ni0glo * mjg0(nn_hls) + mig0(nn_hls)
• or (equivalent formulation): paral(2) = Ni0glo * (mjg0(Njs0)-1) + (mig0(Nis0)-1)

• paral(5) = jpiglo with: paral(5) = Ni0glo

• CALL oasis_def_partition ( id_part, paral, nerror, jpiglo*jpjglo ) with:
• CALL oasis_def_partition ( id_part, paral, nerror, Ni0glo*Nj0glo )

SAS+OASIS runs successfully with these modifications and halos sizes of 1 or 2

[gsamson]

In 13413:

Error: Failed to load processor CommitTicketReference

No macro or processor named 'CommitTicketReference' found

[smasson]

In 13414:

Error: Failed to load processor CommitTicketReference

No macro or processor named 'CommitTicketReference' found

[gsamson]

For the record, there is a bug in OASIS3-MCT v4.0 (rev 4ed658b) when using land proc suppression which is detailed here and not yet corrected:
​https://portal.enes.org/oasis/faq-forum/oasis3-forum/debug/557438564

The following lines in "lib/mct/mct/m_AttrVectComms.F90" must be commented to get nemo working properly with oasis:
+ !if(GlobalSegMap_haloed(GSMap)) then
+ ! ierr = 1
+ ! call die(myname_,"Input GlobalSegMap? haloed--not allowed",ierr)
+ !endif

[smasson]

In 13415:

Error: Failed to load processor CommitTicketReference

No macro or processor named 'CommitTicketReference' found