Re-order output file to follow SIF formatting

[winatony]

Love the tool, its been very simple to set up and use, and provides thought provoking results.

This may seem a small quibble, but I thought I would at least ask. Standard simple interaction format (SIF) graph files contain 3 columns, source - relationship - target:

nodeA <relationship type> nodeB

Current Smetana -d output orders as:

Reciever Donor Compound

Relationship type is already implied in SMETANA output, so having a column for it is unnecessary. Unless it is of utmost importance to keep the original order, why not format output to be in line with standard file types, and have the Donor column before the Receiver column?