[Live-demo] small update on updates

[Hamish]

Hi,

fyi, these small tasks are all now taken care of.

- open + closed bugs now listed on the wiki page. suggest putting the
  word "Errata" somewhere prominent linking to it or on it.
  http://wiki.osgeo.org/wiki/Live_GIS_Disc#Issue_Tracker

- firefox keep-alive fix now scripted in svn trunk, requires testing
  from next major rebuild. (firefox must be run before install_main_docs.sh
  so prefs.js file already exists)

- 2.0.1 torrent link removed from download page pending new release

- Mac 3-button mouse button hint added to hardware requirements text



Hamish