tap/perl: add copyright notice, version string, and emacs stuff

tap/perl: add copyright notice, version string, and emacs stuff

* lib/tap-driver.pl: Add proper copyright notice and bug reporting
address.  Remove obsolete heading comments.  Add trailing comments
for emacs w.r.t. code-formatting rules and automatic updating of
the date-based script version saved into the `$VERSION' variable.
($VERSION): Define to the current UTC date.