taylor diagram function with less hard-coding

Hi all,
Attached is a slightly modified taylor_diagram function, with less
hard-coding of axis limits etc. Also, i have passed the very many
variables to local (would be nice if someone double-checked). The
drawing of RMS "semi-circles" is automated provided there is enough
space for a "full semi-circle". Need to figure out a nice way to make
the RMS circles end nicely on the "outer arc" where is there not enough
space, but i have no time, and maybe someone else can automate that?
There are ample comments of my changes at the start of the script.
Hope this is helpful.
Cheers,
Jatin.

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