Added more solutes.

Conflicts:
	input/solvation/libraries/solute.py
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!

Changed parentheses to curly brackets in some solvation groups.

For some reason these had were parentheses and caused atom
bonding errors.
Merge pull request https://github.com/GreenGroup/RMG-database/pull/43 'bslakman-solvation-fixes'