[REFACTOR]CSVlib : Update to the latest specifications
requested to merge gh-330bd55d/78/mensiatech/refactor-thga-core-487-CSVlib-specifications-update into master
Created by: tgaugry
Add the original number of samples to the time header for spectrum Remove Epoch column for spectrum Add "End time" column instead of timespan column Replace litterals with constants Add m_PreDataColumnCount and m_PostDataColumnCount (and use them instead of litterals)
Tracker Reference: Jira CORE-487