Added info on Acces I/O board bug fix.

git-svn-id: https://redoubt.ligo-wa.caltech.edu/svn/advLigoRTS/branches/branch-2.5@3135 6dcd42c9-f523-4c6d-aada-af552506706e

NEWS

+- Bug fix for Acces I/O 8 and 16 channel relay boards for release 2.5.2.
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 Tagged Release 2.5, with final set of changes listed below.
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