IdP version in the code

[Tom Zeller]

> Where it's at now is idp-parent, not idp-conf. I'll try moving it to
> idp-core, which is where the Version class is sitting for the time being.
> If that works, that's something for now.

Just a comment that when I ported the generation of the manifest from
v2 to v3, I choose idp-parent because I thought it might be a good
idea to determine the version of each module by reading the manifest
of each jar, but obviously that did not work for jars other than those
containing Version.class.