Refs #9241 calculateCentroid is problem; try double
Revert "Refs #9241 calculateCentroid is problem; try double"

This reverts commit 02193e7ffb7e7b7467df5dc7a09921bcc7d84615.
Refs #9241 parallel loop of centroid
Refs #9241 calculate centroid once
Merge branch 'feature/9241_parallel_FindPeaksMD' into develop