Environment configuration parameter support.

## Package Specification

Attributes of Berkeley Db, Java Edition may be set programmatically or through a properties file in the environment home directory. In general, applications that want to set environment attributes will do so through the setter methods provided in configuration classes such as com.sleepycat.je.EnvironmentConfig.

Occasionally the application will choose to set a less frequently used attribute through EnvironmentConfig.setConfigParam(). The classes in this package are used with that method.