Add package metadata.
Correct name for org package.
ObTypo.  I have no idea what this was doing here.
Change interactive-p to called-interactively-p.

The first was obsoleted in Emacs 23.2; this kind of sets a floor on
what version of Emacs I'm going to support with this.

See https://github.com/saintaardvark/twiki-org/issues/3.
Malformed function.  See https://github.com/saintaardvark/twiki-org/issues/2.
ObTypo -- called-interactively-p takes an argument.
Add twiki-org group.  In prep for using in defface.
Put this defface in group twiki-org.
Put twiki-org group in Org.

See:
* https://lists.gnu.org/archive/html/emacs-devel/2005-05/msg00631.html
* https://github.com/saintaardvark/twiki-org/issues/1
ObTypo: forgot to quote 'org.