New program: mktemp.

New program: mktemp.

* NEWS: Mention this.
* README: Add mktemp to the list.
* AUTHORS: Add this: mktemp: Jim Meyering
* src/mktemp.c: New file.
* src/Makefile.am (bin_PROGRAMS): Add mktemp.
(mktemp_LDADD): Add $(LIB_GETHRXTIME).
* man/mktemp.x: New file.
* man/Makefile.am (dist_man_MANS): Add mktemp.1.
(mktemp.1): New dependency.
* man/.cvsignore: Add mktemp.1.
* man/.gitignore: New file.
* src/.cvsignore, src/.gitignore: Add mktemp.
* tests/misc/mktemp: New file.
* tests/misc/Makefile.am (TESTS): Add mktemp.
* tests/Coreutils.pm (run_tests): Give the POST-test function
access to stdout and stderr contents, so it can verify that
the named-on-stdout file/dir does indeed exist and has proper
permissions, etc.
[po/ChangeLog]
* POTFILES.in: Add src/mktemp.c.