Cleaned comments and changed END to follow_up
Made exceptions in follow_up for subtests and done_testing
Made DummyTap is closer to origin format
t/Util.pm appends outputs to temp file

Without this STDERR and STDOUT could clobber each other
Removed label from follow_up
Removed exit code function and diag for no plan & no done_testing

Test::Stream seems to output the exit code correctly. Test::Stream also
outputs the diag for tests with have no plan and dont call done_testing.
Removed src line warning
Removed debugging info and unnecessary comments