Support for arbitrary name field, zoom field, and point-size with simple filtering.

[nvkelso]

• Added support for arbitrary place label text in --name-field option.
• Added support for arbitrary "zoom start" --zoom-field option.
• Added support for variable townspot point sizes with --point-size (universal) and --point-size-field (per feature) options.
• Added support to limit results based on --filter-field value match.

Which addressees:

https://github.com/migurski/Dymo/issues/30 https://github.com/migurski/Dymo/issues/29 https://github.com/migurski/Dymo/issues/28

And should already reflect your changes to the lat/long stuff in your version of 0.9 release.