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Changing floats to doubles for FPE fix (ATLASRECTS-5608)

Audrey Katherine Kvam requested to merge akvam/athena:TestFPE into master

Fix for ATLASRECTS-5608 where an FPE is seen in MSVertexRecoTool. The radial position of a reconstructed vertex is calculated to be exactly zero because of a precision issue, which causes a crash when attempting to calculate eta. Changing from floats to doubles in the reconstruction step allows the calculated radial position to be non-zero, getting rid of the FPE.

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