bugfix: lib/sh/local.sh: pg_as_root(): need to use -E (preserve environment) option to sudo, so that $schema, $table get passed through

bugfix: lib/sh/local.sh: psql(): only \set schema, table if $schema, $table are non-empty, because otherwise, you will get a "zero-length delimited identifier" error

added inputs/.geoscrub/geoscrub_output/geoscrub.csv.run to export the geoscrub table (must be run on vegbiendev)

lib/sh/local.sh: added require_remote()

lib/sh/db.sh: added pg_as_root()

lib/runscripts/util.run: added $wrap_fn to run any function via sudo, etc.

Added instructions for dependencies in the README.

Added indexes to speed up geonames-to-gadm.sql.

Without these indexes, these queries could take hours to complete.
With them, the times more closely matched the times Jim noted in the sql
comments.

Fixed a couple of syntax errors in geovalidate.sh.

Fixed a sql syntax error and a bash syntax error in the next line.

planning/timeline/timeline.2013.xls: "geoscrubbing automated pipeline": scheduled for after Paul's current set of tasks on the geoscrubbing re-run is complete. i'm budgeting several weeks for this since my understanding is that Paul is doing this part-time.