ticket:10908 LocaleDisplayNames thread safety fix.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35989 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10903 u_strToUTF8WithSub(), API docs misleading regarding error status setting.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35991 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10877 Dictionary Break Iterator, work in progress.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35992 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10877 Branch for Dictionary BreakIterator work.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35993 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10877 Branch Maint for Dictionary Break Iterator work.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35994 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10877 Branch Maint for Dictionary Break Iterator work.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35995 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10877 Dictionary Breaks, merge from jchye's branch.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35996 251d0590-4201-4cf1-90de-194747b24ca1