Version upgrades - JQuery 1.3, JQuery UI, messaging

[Antranig Basman]

In chatting to Colin, he pointed out that a feature I was thinking
of integrating into our DOM binder (back-tracks for selectors)
is already in JQuery 1.3 - this only adds to the pressure to get
these version upgrades tried out as soon as we can. Unfortunately
I read the following version note today: 


stable release, jQuery UI 1.5.3 is only compatible with jQuery 1.2.6
preview release, jQuery UI 1.6rc6 is only compatible with jQuery 1.3+


This implies that we would also upgrade trunk to this preview
release of jQuery UI - this would only make sense if we were 
sure that the final would be available before our own 0.8
release. Since it was implied to be released last Saturday,
I think this seems a good bet.

So, let us try to bash through this tomorrow (or I might try
the raw file upgrades tonight and try and pick up a few pieces).

The "upstream goal" was that I was trying to improve diagnostics
from the framework - I am working on the Pager, and had managed
to configure it without a PagerBar, and the resulting failure
was pretty opaque - an empty JQuery was handed to the 
fluid.container() method which had been evaluated several 
levels further up the stack in the DOM binder of the overall
pager. We need to make sure that meaningful diagnostics are
emitted by the framework in all reasonable cases, in particular
ones which sensibly guide the user to resolution of the problem.
In the short term this will cause some file bloat of the
framework files, but we should work towards a properly 
decoupled messaging system (perhaps even with I18N) for the 1.0
release to mitigate this.

Boz.