Update a few comments
scriptText() gets/sets the text of a script in a cross-browser manner.
Refactor normalize() (which was an optional external function),
deneutralizeAll() out of HTMLLoader.

The old normalize() call is superfluous since HyperFrameset has transforms,
and deneutralizing needs to wait until after transformation.
If the staging document is inert then deneutralizing is unnecessary.

The old (internal) prenormalize() is now called normalize().
Implemented <hf:transform> allowing a sequence of transforms to be applied before inserting frame content.
hf:body@transform -> hf:transform@type
hf:body@format -> hf:transform@format

There was also an unresolved bug in IE8, IE9 doc deneutralizing.