Dev guide chgs from 6.1.x

Hi Rich,

Here are the changes for TRUNK that are applicable from 6.1.30 release. I made them in 6.1.x branch before I left for vacation and didn't want to forget to propagate them to trunk.

The changes involve the common plugin security pitfalls, rework of example for marketplace versioning, security management enabling requirements, and some generalization of [version] and [app server] throughout the guide.

fyi - I'll update the version numbers when I prepare the guide for the 6.2 release.

It's ready for trunk.

Thanks!