Refactor package names to match module names

[Tom Zeller]

Most of the time, package names match their module names thus making
it easy to identity the module that a fully-qualified class name is
located in, for example, when working from a Spring configuration file
to Java. There are some exceptions, and I would like to refactor :

+ idp-core : net.shibboleth.idp -> net.shibboleth.idp.core

+ idp-auth-api : n.s.idp.session -> n.s.idp.auth.session

+ idp-profile-* : n.s.idp.relyingparty -> n.s.idp.profile.relyingparty

+ spring-extensions : n.s.ext.spring -> n.s.spring.extensions

Comments ?

(This is easier now that the testbed is in sync.)