DataInspectorTool: wrong placement of labels unless using linear axis Y1

[cpascual]

label coordinates are always transformed using Y1 mapping (and assuming linear axes) To reproduce:

• launch taurus tpg plot "eval:zeros(10)"
• use plot configuration to move the curve to Y2
• pan the Y1 axis a bit (so that the zeros of both axes are not aligned)
• launch the data inspector.

You will see that the inspector labels appear at the zero of Y1, instead of the zero of Y2

Another manifestation of this same bug occurs with log axes:

• launch taurus tpg plot "eval:linspace(.01,1,10)"
  • set Y axis as log scale and set Y scale to min=-2, max=1
  • launch data inspector

You will see that the label is misplaced: