Removing link to out-of-date Ice binaries at Glencoe (rebased onto dev_5_0)



This is the same as gh-607 but rebased onto dev_5_0.

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Further to email between @joshmoore, @sbesson and @stick, this PR removes the link to old Ice binaries hosted on Glencoe and recommends Snow Leopard users use Homebrew to install OMERO.server instead.