fix: errors constructing RSMSectionedPolynomialSensorModel from TREs

[edparris]

These changes fix errors in how RSMSectionedPolynomialSensorModels are constructed from TREs.

• The floating point coefficients of the low order polynomial were incorrectly being transformed to int which caused ValueErrors.
• The first section row/column numbers start at 1 not 0 so the code constructing the array of section sensor models needed to be updated to match.
• We will release these fixes as an immediate PATCH release so the library version number has been incremented to 1.1.2.

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