This PR adds support for nemo 5.0

[rcaneill]

No description provided.

[rcaneill]

In my nemo 5.0 test data, it seems that they changed the name of some dimensions.

ncdump -h gives

netcdf GYRE_1y_00010101_00011230_grid_T {
dimensions:
	axis_nbounds = 2 ;
	x_grid_T = 32 ;
	y_grid_T = 22 ;
	deptht = 4 ;
	x_grid_T_3D_inner = 32 ;
	y_grid_T_3D_inner = 22 ;
	grid_T_3D_inner = 4 ;
	time_counter = UNLIMITED ; // (1 currently)
variables:
	float nav_lat_grid_T(y_grid_T, x_grid_T) ;
		nav_lat_grid_T:standard_name = "latitude" ;
		nav_lat_grid_T:long_name = "Latitude" ;
		nav_lat_grid_T:units = "degrees_north" ;
	float nav_lon_grid_T(y_grid_T, x_grid_T) ;
		nav_lon_grid_T:standard_name = "longitude" ;
		nav_lon_grid_T:long_name = "Longitude" ;
		nav_lon_grid_T:units = "degrees_east" ;
	float deptht(deptht) ;
		deptht:name = "deptht" ;
		deptht:long_name = "Vertical T levels" ;
		deptht:units = "m" ;
		deptht:positive = "down" ;
		deptht:bounds = "deptht_bounds" ;
	float deptht_bounds(deptht, axis_nbounds) ;
		deptht_bounds:units = "m" ;
	float nav_lat_grid_T_3D_inner(y_grid_T_3D_inner, x_grid_T_3D_inner) ;
		nav_lat_grid_T_3D_inner:standard_name = "latitude" ;
		nav_lat_grid_T_3D_inner:long_name = "Latitude" ;
		nav_lat_grid_T_3D_inner:units = "degrees_north" ;
	float nav_lon_grid_T_3D_inner(y_grid_T_3D_inner, x_grid_T_3D_inner) ;
		nav_lon_grid_T_3D_inner:standard_name = "longitude" ;
		nav_lon_grid_T_3D_inner:long_name = "Longitude" ;
		nav_lon_grid_T_3D_inner:units = "degrees_east" ;
	float grid_T_3D_inner(grid_T_3D_inner) ;
		grid_T_3D_inner:name = "grid_T_3D_inner" ;
		grid_T_3D_inner:long_name = "Vertical T levels" ;
		grid_T_3D_inner:units = "m" ;
		grid_T_3D_inner:positive = "down" ;
		grid_T_3D_inner:bounds = "grid_T_3D_inner_bounds" ;
	float grid_T_3D_inner_bounds(grid_T_3D_inner, axis_nbounds) ;
		grid_T_3D_inner_bounds:units = "m" ;
	double time_centered(time_counter) ;
		time_centered:standard_name = "time" ;
		time_centered:long_name = "Time axis" ;
		time_centered:calendar = "360_day" ;
		time_centered:units = "seconds since 1900-01-01 00:00:00" ;
		time_centered:time_origin = "1900-01-01 00:00:00" ;
		time_centered:bounds = "time_centered_bounds" ;
	double time_centered_bounds(time_counter, axis_nbounds) ;
	double time_counter(time_counter) ;
		time_counter:axis = "T" ;
		time_counter:standard_name = "time" ;
		time_counter:long_name = "Time axis" ;
		time_counter:calendar = "360_day" ;
		time_counter:units = "seconds since 1900-01-01 00:00:00" ;
		time_counter:time_origin = "1900-01-01 00:00:00" ;
		time_counter:bounds = "time_counter_bounds" ;
	double time_counter_bounds(time_counter, axis_nbounds) ;
	float toce(time_counter, deptht, y_grid_T, x_grid_T) ;
		toce:standard_name = "sea_water_potential_temperature" ;
		toce:long_name = "temperature" ;
		toce:units = "degC" ;
		toce:online_operation = "average" ;
		toce:interval_operation = "7200 s" ;
		toce:interval_write = "1 yr" ;
		toce:cell_methods = "time: mean (interval: 7200 s)" ;
		toce:_FillValue = 1.e+20f ;
		toce:missing_value = 1.e+20f ;
		toce:coordinates = "time_centered nav_lat_grid_T nav_lon_grid_T" ;
	float soce(time_counter, deptht, y_grid_T, x_grid_T) ;
		soce:standard_name = "sea_water_practical_salinity" ;
		soce:long_name = "salinity" ;
		soce:units = "1e-3" ;
		soce:online_operation = "average" ;
		soce:interval_operation = "7200 s" ;
		soce:interval_write = "1 yr" ;
		soce:cell_methods = "time: mean (interval: 7200 s)" ;
		soce:_FillValue = 1.e+20f ;
		soce:missing_value = 1.e+20f ;
		soce:coordinates = "time_centered nav_lat_grid_T nav_lon_grid_T" ;
	float e3t(time_counter, grid_T_3D_inner, y_grid_T_3D_inner, x_grid_T_3D_inner) ;
		e3t:standard_name = "cell_thickness" ;
		e3t:long_name = "T-cell thickness" ;
		e3t:units = "m" ;
		e3t:online_operation = "average" ;
		e3t:interval_operation = "7200 s" ;
		e3t:interval_write = "1 yr" ;
		e3t:cell_methods = "time: mean (interval: 7200 s)" ;
		e3t:_FillValue = 1.e+20f ;
		e3t:missing_value = 1.e+20f ;
		e3t:coordinates = "time_centered nav_lat_grid_T_3D_inner nav_lon_grid_T_3D_inner" ;

// global attributes:
		:name = "GYRE_1y_00010101_00011230_grid_T" ;
		:description = "ocean T grid variables" ;
		:title = "ocean T grid variables" ;
		:Conventions = "CF-1.6" ;
		:timeStamp = "2025-Jan-14 15:48:57 GMT" ;
		:uuid = "3fcd5091-2555-4f9a-8613-f49975a58927" ;

and similarly on the U,V points. So we should now handle the XX_grid_X_2D/3D_/inner dimensions

[rcaneill]

I forgot that it was already raised in #34 and partly fixed in #57

[rcaneill]

We are just left with the vertical, i.e. the grid_T_3D_inner (and maybe other ones...)