The env variable is renamed to 'path' to be consistent with the use in trecbox.py. SysTerrier no longer performs a backup of existing index as this task is already handled by init() in trecbox.py and all systems are give a clean tree on the file system to write output files to.
conf and layout are the representative files that encode the output and input file paths and experiment layout in JSON. Edit the first key in conf to point to the correct base directory everytime trecbox is used in a new system. 'layout' should be copied and renamed to the name of the experiment and modified to include the proper layout. It's name is used by trecbox to name the root of the output directory tree.
Configurationa and experiment layout handled more neatly.
added short notes on the major changes to trecbox design