Do not send expiration date header with modules

Rely instead on ETags to know to respond with a 304
Update TODO notes
Add RRD4J as compile dependency

Correctly add generated source directories to the IDEA module
Add note about missing licenses
Add notes about recenlty added dependencies
Add ElementWrapper.text()
Create T5Dashboard page

Convert PageCatalog and ServiceStatus into page fragments, in the t5internal library.
Change the Hibernate Statistics page into a page fragment for the dashboard.