Include a way to clean the ts and csv tables.

* util/derandui.py (_createDerandStruct, onClickTimeStreamList)
(onClickCsvList): When all the ts or csv rows are eliminated from the left
lists, we remove all elements from the respective tables.
Make sure that all items not none in master list.

* util/derandui.py (_genMaster): When we encounter a none value in one of the
lists (csv or ts), we translate it into " "