perf tuning checkins

I've checked in some perf tuning changes to about 4 files today.
There are no public features added (or broken, hopefully).

Some of the perf changes include:
- eliminate useless testing of hasAttr before getAttr
- use firstChild/nextSibling loop instead of childNodes loop in DOM
- don't play games with arguments arrays, just use Function.call
- in the sort table widget, don't parse its potentially myriad children;
   just assume there are no property declarations there.

Some of the cleanups include:
- attempt to straighten out some more cases where Array instances are
   pointlessly used for non-Number index lookup.

btw, as a consequence of changes i and alex made over the past few weeks,
it should be possible to do the moral equivalent of cat of the js files
into a single library file, as long as you get the order right.
This will avoid a lot of If-Modified-Since checking and dynamic loading
of files.

This is created with the "single-core-file" ant target.
To make it work requires some settings in nwWrapper.js concerning "autoload"
and probably "rootPath".
I'll let alex clarify; i don't know how far he has taken it.

-mda



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