#1 database connection properties

[Horst Dehmer]

support for user definable database connection
properties/definition to be used throughout the client
session.

Properties:
- connection name (e.g. 'seiji@medusa (postgres)')
- jdbc driver class name
- database url
- user name
- password

Operations:
- create new connection definition
- update/delete existing connection definition
- select existing connection definition for usage