Copy MESA (15140) data to AMUSE data dir

[rieder]

Currently MESA data (e.g. pre-calculated ZAMS models) are stored in the src/ dir in the MESA directory. After making the worker, these should be moved to the AMUSE data directory, since the src/ dir is not available in the AMUSE pip packages. This directory is defined as:

import amuse.config
data_dir = amuse.config.get_amuse_root_dir()+'/data'

(maybe we should make a separate get_amuse_data_dir function?)

Currently, the data directory doesn't always exist (maybe pip doesn't like creating empty directories?), so a check if the dir exists and create it if it doesn't may be needed.

[rjfarmer]

Previous discussion #872 for reference

[rieder]

Yes, thanks for adding that reference!

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