Merge branch '1-cast-to-String-before-stripping' into '1-crash-in-a-test-file-with-non-empty-z-column'

Resolve "Crash in a test file with non-empty Z column" in patch branch

See merge request !3

Fix default settings which prevent copying of setting states between master and worker processes in multithreaded mode. 

Output UID in Winner selection log.

See merge request !1

`labeled(self)` may crash when the whole "Z" column is neither empty nor of type String (i.e. a number). Added prior casting.

Logs of the winner selection after reconstruction lack the winners uid,
making it hard to find out which construction method won.
You already pass the uid to the WinnerSelectionInfo class but it's not
used there, so you may have forgotten to log it there. 
I just added uid to the things being logged for the winner selection.
Please revisit again if this is intended or not. 
Thanks