Added two functions getFileMetadata and checkCollectionInPresampledInput to OverlayReadMetaData.py in order to check if the input truth collections are in the RDO_BKG file before copying them in the FastChainSkeleton.EVGENtoRDOwOverlay.py.
getFileMetadata
checkCollectionInPresampledInput
cc @tadej, @jchapman, @tcuhadar, @lmijovic, @golling