Update the version of jQuery being used to the latest one.

[daniell]

For various reasons, it has become desirable to update the version of jQuery we're using to the latest one. These include making it easier to use client side validation on action item forms to allow for in-line adding and updating of action items, as well as problems with the 'live' method we're currently depending on.

There are a few things that would need updating, but is there any good reason not to do this?