throw missing exception when batch importing using BTE via admin UI
change default BTE configuration for CSV and TSV data loaders
Fix a bug that brings down the webapp container.

Instead of using System.exit() the method addItems now throws an
exception that can be handled higher in the calling stack, or will
terminate the thread.
addBTEItems rethrows BTE exceptions
Update dependency to the latest BTE release
Merge pull request #446 from EKT/DS-1857

DS-1857 Unhandled exception in BTE batch import when uploading CSV files with misconfiguration options