Small refman patch; point-and-click

[Graham Percival]

I tried to get point-and-click working with vim and discovered that the line
currently in refman[1] produces an error.  A quick search of the lilypond-user
revealed a different command, so I'm adding it to refman.  I don't know
if the old command still works (with 1.4 maybe?), since I don't know anything
about point-and-click.  :)

[1] #(ly:set-point-and-click 'line)

Cheers,
- Graham

patch-refman
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