Fix for Ginga upstream deprecation #236
Merged
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Description
Address upstream deprecation of the move_to() call on a Ginga canvas object
the move_to(x, y) call on a canvas object has been redefined in terms of move_to_pt((x, y)) since Ginga v2.6.5. move_to() has issued a DeprecationWarning since v4.0.0
this fixes the plugins to use move_to_pt(). It is compatible with Ginga back to v2.6.5