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).

inputs/.geoscrub/import_order.txt: added county_centroids so that it would be installed by new-style import

bugfix: inputs/*/*/postprocess.sql: made all operations idempotent, so that postprocess.sql can be run repeatedly (e.g. by new-style import)

added inputs/*/*/header.csv for CSV inputs, which are now generated by inputs/input.Makefile %/install

inputs/input.Makefile: SVN: add, %/add: */logs: also svn:ignore *.gz, used for compressed log files

Added inputs/.geoscrub/county_centroids/ from Jim