** Earthquake data via the USGS website with Common Lisp

Main information on this example is in the file usgs.txt.  The `usgs'
module uses these modules:

  Module		Documentation location
  ------		----------------------
  measures		measures/readme.txt
  zipcodes		zipcodes/readme.txt
  google-maps		google/google-maps.cl

This software was tested in a fully patched (as of 10Jan2007) Allegro
Common Lisp 8.0.
