a patch on issue 2551421 will redo the registration methods.

It does away with __getattr__ by calling setattr on the TemplatingUtil object
instance for the tracker. This simplifies lookup.

The instance.registerUtil* methods block registering any util starting with
'_' or the name client. But all other methods on the TemplatingUtil object can
be replaced by registering them.

The instance registerUtil* methods check for duplicate names and give pointers
to the files/lines where the conflict happens.