Fix position of accel_init call (fixes multisystem test on GPUs)
Description
Move accel_init out of system to run, before fft_init.
This is needed to make the GPU FFTs work - the accel part needs to be initialized before the FFT part. Moreover, accel is a global module and does not depend on system, so probably it's best to be initialized globally.
This also fixes the multisystem test on the GPU.
News snippet
Fix position of accel_init (fixes multisystem test on GPUs).
Checklist
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I have checked that my code follows the Octopus coding standards