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).

Initial checkin of geoscrub install SQL files.

Added install.*.sql files that will do initial table creation for all
required tables.
Added a truncate.vegbien_geoscrub.sql script that will clear tables related to
data downloaded in load-geoscrub-input.sh....