This version is the master branch of the OASIS3-MCT climate coupler. It will contain the future developments for OASIS3-MCT_5.0

Since the first developments of OASIS3-MCT, it includes:
- A first beta version of Python API available (STFC)
- Add ability to set north and south thresholds on the SCRIPR CONSERV namcouple line. 
- Add number of neighbors to the mapping filename for DISTWGT and GAUSWGT mapping files 
- A « True » area normalisation in conservative remapping
- An addition of “additional nearest-neighbour” option in SCRIP CONSERV/DESTAREA (DESTNNEI, DESTNNTR)
- The possibility to deactivate the “additional nearest-neighbour” option (BILINEARNF, BICUBICNF, DISTWGTNF, and GAUSWGTNF)
- A bugfix for local distance calculation in DISTWGT and GAUSWGT interpolation
- More systematic test of NetCDF returned error code
- Fractional masks for the global conservation operation CONSERV (ESiWACE2)
- New options in global CONSERV to conserve fields with positive and negative values with average value close to zero (ESiWACE2)
- An hybrid MPI+OpenMP parallelisation of the SCRIP library (previously fully sequential) leading to great reduction in the offline calculation
- A new communication method, using the remapping weights to define the intermediate mapping decomposition, offering a significant gain at run
- New methods introduced in the global CONSERV operation reducing its costs by one order of magnitude while still ensuring an appropriate level
- Support for bundle coupling fields;
- Automatic coupling restart writing;
- Memory and performance upgrades;
- A new LUCIA tool for load balancing analysis;
- New memory tracking tool (gilt);
- Improved error checking and error messages;
- Expanded test cases and testing automation;
- Testing at high resolution (> 1M gridpoints), high processor counts (32k pes), and with large variable counts (> 1k coupling fields);
- Bicubic and Second Order Conservative interpolations (with the gradients of the fields being provided by the models);
- Exchange of data on only a subdomain of the global grid;
- The specification of how time statistics are written out (variable TIMER_Debug) in the configuration file “namcouple”;
- Abilty to normalize the conservative remapping weights by the true areas of the grid using gridcell fraction
- New CONSERV options to normalize postive and negative values separately

Please keep us informed of your progress with OASIS3-MCT and do not forget to cite the following latest reference in your paper describing your coupled model results.::
A. Craig, S. Valcke, L. Coquart, 2017: Development and performance of a new version of the OASIS coupler, OASIS3-MCT_3.0, Geosci. Model Dev., 10, 3297-3308,https://doi.org/10.5194/gmd-10-3297-2017, 2017.   

If you have problems or questions, please check the forum on the OASIS3-MCT web site (https://portal.enes.org/oasis) or contact us at oasishelp@cerfacs.fr .