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This back-ports commit 13d856e177e69083 and assorted followon patches into 9.4 and 9.5. 9.5 and HEAD are now substantially identical in all the files touched by this commit, except that 010_pg_basebackup.pl has a few more tests related to the new --slot option. 9.4 has many fewer TAP tests, but the test infrastructure files are substantially the same, with the exception that 9.4 lacks the single-tmp-install infrastructure introduced in 9.5 (commit dcae5faccab64776). The primary motivation for this patch is to ensure that TAP test case fixes can be back-patched without hazards of the kind seen in commits 34557f544/06dd4b44f. In principle it should also make the world safe for running the TAP tests in the buildfarm in these branches; although we might want to think about back-porting dcae5faccab64776 to 9.4 if we're going to do that for real, because the TAP tests are quite disk space hungry without it. Michael Paquier did the back-porting work; original patches were by him and assorted other people.