Version check should just be < not <=
First set of changes to support using main content field (editor) instead of the bio field.

I don't see why the bio field is needed. The content/editor field is commonly overloaded as the primary content blog for the item.
Using it also makes templating a little easier because the standard template tag "the_content" can be used, etc.
Fix two bugs in the view: Variable left undefined due to an if condition; text before and after the main [staff-loop] are now preserved.
Changes to fix uninitialized variables, and also wrapping calls to custom fields in a set of functions (less boilerplate, undefined checks.)