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1) A new guided option is available to output forcing file that can be reused for a newt nudged cglobal or LAM configuration. It is activated using guided_type flag :
guided_type = nudging_forcing

in this case, new run.def parameters are available to control output frequency and output area :
nudging_freq : output frequency in second
nudging_lon_start : longitude starting zone in degree (default=-180)
nudging_lon_end   : longitude end zone in degree (default=180)
nudging_lon_delta : longitude resolution ind degree (default=1.)
nudging_lat_start : latitude starting zone in degree (default=-180)
nudging_lat_end   : latitude end zone in degree (default=180)
nudging_lat_delta : latitude starting zone in degree (default=-180)

2) improve nudging, and merge nudging functionality when using forcing file coming from previous dynamico simulation or ERA5 reanalysis

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The switch between the legacy version (LMDZ start) and ERA5 is done by using a new run.def parameter :
etat0_database_type = legacy (default) / ERA5_forcing

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In case of starting model with interpolated start file (etat0=start_interp), the initial state start0.nc is now output.
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Manage automatically switch from xios XML start/restart file for reading/writing, or not, fields required by non-hydrostatic model.
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Vertical remapping can be done using XIOS axis interpolation or using inter dynamico remapping. Switch between this two choice using def parameter :
nudging_vertical_levels = 'pressure' / 'model'
'pressure' (default) : vertical level of forcing fields are in fixed pressure level, no need to read pressure field (or soil pressure) to make the guiding, so vertical remapping is done with DYNAMICO.
'model' : vertical level of forcing fields are in model level, so pressure forcing field is needed to make correct vertical remapping.
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Fix bug introduced in the last commit. Global indexes for output was depending of the configuration (nb proc), ie a restart could not be read correctly for a new start if number of process was changing.
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Backport from devel : introduce grid_type in TYPE(layout) and use it for allocation and halo exchange

small changes in testing to compile xios with same env file than dynamico 
port testing from jean-zay to irene

Work around FCM bug

See merge request !53

Hotfix/trunk/heldsuarez

See merge request !52