2006.09.30 : Added several kinds of descriptors

2006.09.30 : Added several kinds of descriptors

• No. of rings from 3 to 7
• No. of bond types
• Addition P+ type having valence 4 of polar surface area
• Estate sum of all, heavy, hetero, Max. and Min Estate value, distance between Max and Min Estate values
• Fraction of VSA Hbond acceptor, donor, (+) and (-) chargable groups