Can anybody point me at a more-or-less standard entity set covering the
International Phoenetic Alphabet?
 
Failing that, can anybody point me at any ad-hoc entity set which does the job?
 
Finally, what is the name of the body responsible for the definition and
maintenance of the IPA?
 
(An orgy of web browsing has uncovered Much Interesting Stuff, but has not
answered these specific questions.)