changes that will (?) go in the spec

[Julian Adams <julian adams gmx net>]

following the discussion over the last few days I will write the
following changes into the spec in the coming week:

(objections / additions ?)

1) _NET_WM_VISIBLE_NAME_STRING -> _NET_WM_VISIBLE_NAME

2) _NET_WM_STATE add:
(define Extended implementations at the beginning of the document)
Extended implementations MAY add new atoms to this list. Implementations
without extensions MUST ignore any unknown atoms, effectively removing
them from the list. These extension atoms MUST NOT start with the prefix
_NET. 

Julian