Save initial condition (for movie)

[paugier]

Fixes #41

For this PR, I will need a real review! :-)

[codecov]

Codecov Report

Base: 61.42% // Head: 61.42% // No change to project coverage 👍

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Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   61.42%   61.42%           
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  Files           9        9           
  Lines         534      534           
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  Hits          328      328           
  Misses        206      206           

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[ashwinvis]

You also need

  include 'CHKPOINTD'  ! chpt_ifrst

In userchk. Otherwise LGTM

[akhoubani]

As @ashwinvis mentioned, because we are using chpt_ifrst after call frame_end, we need to include 'CHKPOINTD'. Another possibility would be

if (istep .eq. 0 .and. (chpt_ifrst == 0) ) then
      ! first timestep which is not restarted
         call outpost(vx, vy, vz, pr, t, '   ')  ! write initial condition
      ! finalise framework
else if (istep.eq.nsteps.or.lastep.eq.1) then
         call frame_end
endif