revert lost feature list / categories from http://www.qa.jboss.com/binaries/RHDS/builds/staging/devstudio-5.0_trunk.updatesite/product/ so it's easier to audit site contents

Denis changed from site.xml containing all the features/catgs to category.xml containing a single feature/catg. This makes quickly perusing the site very difficult.

Propose we revert to the old approach so releng/QE/devs can more easily see the contents of the JBDS update site.

Also need to change the template/XSLT so that it points to category.xml instead of site.xml, and expose the .all feature, now that it's available on the same site.