#182 EJB container config override simplfied

[Scott M Stark]

Simplify support for overriding standard container
configurations. The container-configuration now
supports an extends attribute through which you
can specify which standard container-
configuration/container-name you want to extend or
override. This allows for simple modifications of
container configurations without having to completely
redefine the configuration. For example, to set the
commit option to A on a given entity bean deployment:
<container-configurations>
<container-configuration extends="Standard CMP
EntityBean">
<container-name>Cached EntityBean</container-name>
<commit-option>B</commit-option>
</container-configuration>
</container-configurations>