Smoother PostgreSQL icons

I noticed that the included PostgreSQL elephant icons (that are used by some
packages to create menu entries and so on) are kind of boxy: elephant48.xpm,
pgAdmin3.ico, pgAdmin3.xpm.  I've created some new ones from the master
source in .ai format: http://www.credativ.com/~pei/pgadmin-icons/.  You can
also easily create those yourself at build time using ImageMagick or let the
packagers build them if you include the .ai in your CVS.