[Proj] Transformation of rotation

[Filip Arlet]

Hi I want to transform rotation in XY (one angle) from one coordinate system
to another (JTSK -> WGS84). I'm want to transform text, defined by origin, 
scale and rotation (angle around z axis). Transfrom scale from one system to
another is not a problem, but how can I transform rotation. I know that 
transformation includes different projections, so its not going to be 
accurate (i would have to transform text definitions too). But partial 
solution is fine.

Filip
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