Fix for url-quoting of allowed special characters, including .
Increase checks on metadata and csv file compatibility in terms of number of columns and virtual columns following non-virtual columns in order.
1.0.1
The bug where substitutions specified in "default" value of a virtual column were url-quoted, causing for example space characters in a string literal to be converted to "%20", is fixed.
Also, the issue about out variable not initialized is addressed.