RSS & Cron Fixes

Updates include a bunch of fixes to the Content Class including:
* Proper Footnote Handling in RSS
* Copyright Message Being Displayed in Posts
* Not saving arrays of data in a cached HTML file (duh)
Cron Update Includes:
* Check for Stuck Cron Records
Globals Update Includes:
* nullInt update to ensure default value passed is used when determined
value is 0