Plugins are not correctly deployed in webapp mode

(At this point I didn't try this scenario step by step any more; basically it is what we did to setup the site, except that we copied our project data from forrest 0.6 before trying the pdf links)

- run forrest webapp to create an empty webapp
- configure Tomcat to run the webapp (we did it by creating a context descriptor and put it onder Tomcat's config directory)
- the pdf links give an error "Resource Not Found"