New file abraham.py

Will contain solute descriptors based on Abraham (1993)
Began entering solute descriptors for fragments

From Platts (1999)
Added Platts' C,H,O groups
Set values for duplicate Platts groups 
(that RMG will count twice) as 0.
Added group defs for some of the parents in tree.
Changed some "Css" groups to be more specific.
Corrected values for carboxylic acid.
Created database for Platts' non-atom centered groups.
Added 6 non-atom centered groups.
Removed non-atom centered groups
These are now included in nonacentered.py
Defined "Cds" as being Cd or CO atom type.
Fixes to non-atom centered groups.
Added Platts groups for benzylic carbons and some non atom centered -OH groups.
Remove cyclic -O- group and put in non-atom centered.
Moved some files to more appropriate directories.

Moved databases for solute group additivity values, and solute and solvent libraries, into an overall folder "salvation".
Moved libraries and groups having to do with solvation into a solvation directory.
Added some solvents, and corrected a value for water.
Added more solvent data to database.
Added correlation coefficients for viscosity.

A-E are correlation coefficients for a liquid's viscosity with 
temperature. They were found in the DIPPR. When inserted into the
proper correlation you will get viscosity in Pa s
For all solvents, added solute parameters A and B.

These can be used to calculate a solvation correction to
the intrinsic rate for H abstraction reactions.
Started creating the solute library.

Currently all solute descriptors are estimated using group additivity;
now they will be looked for in a library first.
Added more solutes to solute library.