Add Magnetlink to available environment variables

[basecase]

This should be an easy one. Add the magnetlink of a completed torrent to the available variables for post-completion scripts. The option is already there in the context menu. Ideally, I would modify the context menu entry to simple copy a text file into the torrent directory with the magnetlink. Say the magnet link in a flat [NameofTorrent?].magnetlink file. This would allow for better reseeding. In an automated fashion

[basecase]

Modified Transmission.h

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Modifed torrent-magnet.h

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Modified torrent-magnet.c

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Patch to add magnetLINK to post download environment variables

[basecase]

So I did this the easy way and just made the magnetLINK an environment variable. Patch attached.

## To add the Magnetlink to environment variables

add this line

## tr_strdup_printf ("TR_TORRENT_MAGNETLINK=%s", tr_tr_torrentGetMagnetLink(tor)),

to the torrent.c file in libtransmission line 2117

[basecase]

Well, if the patch is not accepted then one can get the same functionality from this line:

magnetLINK=$(transmission-remote -t $TR_TORRENT_ID -i | grep "Magnet:" | sed -r 's/^.{10}//')