Fix indentation.

Not syntactically important, but eclipse was complaining about there
being 11 spaces instead of 12.
Turn an implicit for loop into an explicit one.

This is less elegant for such a simple loop, but we are
about to add much more complexity to it, so this is a 
first step.
Also, I made it only save the species name (the first row
of the adjacency list) instead of the whole adjacency list.
Improved blank-line-removal

Before it removed duplicates, which meant we go the first blank
entry but it removed all subsequent ones. Now we actually check
for blank entries.
Save species SMILES string in new column

You need to ensure rmgpy is on your python path, so that
you can import rmgpy.