moved everything into /trunk/ to create the standard svn layout, for use with tools that require this (eg. git-svn). IMPORTANT: do NOT do an `svn up`. instead, re-use your working copy's existing files with `svn switch` (http://svnbook.red-bean.com/en/1.6/svn.ref.svn.c.switch.html).
schemas/VegCore/: moved ERD-related files to ERD/ subdir
added schemas/VegCore/VegCore.ERD.letter_size.pdf. this must be generated in Linux rather than Mac, because the Mac PDF printer messes up the colors in the PDF (missing color profile?).