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sticky as well and made sticky the default.  Reimplemented the
global minor mode.  Updated the commentary section to document
these changes.
(hl-line-sticky-flag): New user option.
(hl-line-overlay): Made it buffer-local and gave it a docstring.
(global-hl-line-overlay): New variable.
(hl-line-mode): Rewritten to use `hl-line-sticky-flag'.
(hl-line-highlight): Rewritten to use `hl-line-sticky-flag'.
(hl-line-unhighlight): Updated docstring.
(global-hl-line-mode): Implemented directly so that is does not
depend on `hl-line-mode' any more.
(global-hl-line-highlight, global-hl-line-unhighlight): New
functions.