#2727 Patch: Make key position configurable in draw

[Gunter Königsmann]

Did add an draw option to configure the key position: Sometimes the legend was utterly in the way and the only way to move it was an user_preamble.

Remember: Work tends to be accepted more often if lines end in the top right ;-)

[Mario Rodriguez Riotorto]

All done.

Thanks, Gunter, for this contribution.

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Mario