ADIOS is changing the debug mode

[lsawade]

The most recent version of adios2 on github is causing a compilation error because the adios2_debug_mode_on/off mode flag is deprecated.

The fix would be

! Create adios handler passing the communicator, debug mode and error flag
! adios2 duplicates the communicator for its internal use
call adios2_init(myadios2_obj, comm_adios, ier)
if (ier /= 0) stop 'Error setting up ADIOS2: calling adios2_init() routine failed'

to replace the older

 if (USE_ADIOS2_DEBUG_MODE) then
    call adios2_init(myadios2_obj, comm_adios, adios2_debug_mode_on, ier)
  else
    call adios2_init(myadios2_obj, comm_adios, adios2_debug_mode_off, ier)
  endif
  if (ier /= 0) stop 'Error setting up ADIOS2: calling adios2_init() routine failed'

I'm hesitant to make a pull request, because it will break specfem for a current installations of ADIOS2. Another fix would be to check which adios version is being used and the do either.

[danielpeter]

thanks Lucas for pointing out! I'll update the init routine together with some other updates I had to do anyway.