branches: 1.1.2;
Add regression tests for PR bin/3914 and PR bin/27140.

Add subtests to verify that both "sleep 0.2" and "sleep 0,2" work
when the locale is ru_RU.UTF-8 (which has ',' as its decimal radix char).
Inspired by a problem with rc.subr experiened by ru_RU.UTF-8 reported on
netbsd-users. These are in the "fraction" test case.

While here, add some more (sub-)tests of invalid input, to make sure they
fail (in the "nonnumeric" test case), and for fun, a couple of subtests
testing hex input fractional delays (in the "hex" test case).

branches: 1.1.2; 1.1.32; 1.1.34;
Add regression tests for PR bin/3914 and PR bin/27140.