NEWS updated to 4.2.8

NEWS

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+Changes for 4.2.8
+==================================================================================================
+- fixed issue where two testpoints couldn't be opened at the same time from the same model
+- fixed RCG bug where deep part links could cause infinite recursion of references
+- delays inserted in shutdown to help prevent zombie luts in the dolphin drivers
+- epics process fails gracefully and with better messages when it can't open a file
+- BURT_RESTORE no longer needed in safe.snap file to start model
+- DACKILL variables in default safe.snap set to more sensible values
+- EDCU now supplies DATA_RATE_KB_PER_S epics variable
+- RCG install step now creats chans/tmp.  Build now creates chans/ipc/<ifo>.ipc
+==================================================================================================
 Changes for 4.2.7
 ==================================================================================================
 - Fixed more calculation out of order bugs.