- Added logging to file of execution times.

- Added support for filtering by eprint ID. ...

- Moved hit type filtering into SQL query where it belongs.

- Added switch to limit type of hits displayed (download vs. abstract). ...

- Added no-cache headers to all files.
- Implemented colour blending for both GD and CSS maps (but only when both
  downloads & abstracts are displayed).
- Removed extraneous content from web pages.
- Rearranged timing calculation for Google map.
- Updated documentation for Google map XML output.

- Implemented back end script for generating CSS maps. ...

- Made code more consistent across all versions.
- Finished CSS map timing code.
- Changed all .html => .php.
- Made styling of all web pages more consistent.
- Included lat/long in hash key for all cities (not just unknown) because
  there may be several different lat/long combinations that map to the same
  city name.