Starting to add Nitrogen Platts groups.

Conflicts:
	input/solvation/groups/abraham.py
Added sulfur groups. Restructured entries.

Conflicts:
	input/solvation/groups/abraham.py
Added some non atom-centered groups for N and S.
Added "A" Abraham parameter for some N and S groups.
Fixed some syntax bugs in the Platts group databases.
Fixed a typo in non-atom centered group files.

Adjacency list had a square instead of curly bracket!
Updated adjacency lists to new style for atom-centered solvation groups.

Since the N and S groups weren't in master, the updates were not applied to them. This adds the unpaired electron labels for these groups.
Conflicts:
	input/solvation/groups/abraham.py
Updated adjacency lists to new style for non atom-centered solvation groups.
Added multiplicity label for all molecules in the solute library.

I made them all have multiplicity = 1. For the existing entries I think this
should be correct...