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).

Split up geonames-to-gadm.sql into 3 scripts.

Each script only operates on one table within a transaction.
These scripts now assume the tables have already been created (by
install scripts added in a previous commit), and each starts out by
truncating the table it will update with new data.