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add symlinks to MAGICC files

Michaja Pehl requested to merge github/fork/0UmfHxcvx5J7JoaOhFSs5mncnisTJJ6q/feature/symlink_magicc into develop

I'm still of the opinion that we can just add the MAGICC files, since you also get them on their website, but here goes:

In order to have a REMIND with on less source of constant failure (#180), we can add symlinks to the ./core/magicc/ directory. The symlinks only contain the information where the files are to be found (e.g.), but no actual data. When the run is assembled by ./scripts/start/prepare_and_run.R, the ./core/magicc/ directory is copied using file.copy() which copies the targets of the links, not the links:

On a POSIX filesystem the targets of symbolic links will be copied rather than the links themselves

so we end up with proper MAGICC in the output directory, without any actuall MAGICC in the repository.

If this is agreeable, pick a proper place for the MAGICC files, not my home directory ;)

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