ticket:10144: mrege of r33679 from ticket:10147 - typo in header guard, layout engine

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ticket:10144: merge r33680 from #10143 - fix memory leak/crash in layoutengine

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/maint/maint-51@33712 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10144: merge r33586,r33587 from #10098 - host failures for DateFormatTest

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ticket:10144: merge r33588,r33590 from #10081 - make stable sort faster

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/maint/maint-51@33714 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10144 bump version # in readme


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