7.4.1 release notes updated

I have updated the 7.4.1 release notes so it has all the current changes
listed. We have addressed all open 7.4.1 items so we are nearing 7.4.1
release time.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
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