Reverse the previous change - we do want to keep deleting lessons. We will fix the issues related to sharing files / removing lessons / deleting files by adding the user id to the content repository.
Don't want to delete any lessons, including preview lessons. This means that we always keep the records showing who created which files in the content repository (important if we need to track who created an offensive file).
Tweaked how the preview deletion is called (now calls the web layer of monitoring not the service directly - if it calls the service then the spring context doesn't contain all the tool details.)Also changed jsps to use the lams custom tags.