Change names of metric coefficients

[JensMadsen]

Very low priority. ....

Why not name metric coefficients e.g. gxx instead of g11? Coordinates are everywhere called (x,y,z) and $gxx = \nabla x \cdot \nabla x$

[bendudson]

Agreed. No idea why I chose g11 rather than the more sensible gxx, and now have deep regret. Sorry.

[JensMadsen]

You are forgiven:-D No big problem. I just have dictionary in my python scripts:-D

[bendudson]

@ZedThree if the Coordinates interface is being changed (and it should) then changing e.g.g11 to gxx is long overdue.