new forum categories

Following up on feedback from raybonz and others, I've added some new forum categories and reorganized our old posts.

Here are the new categories:

* welcome / open talk (same as before)
* creating POI files (evolved from POI help)
* sharing POI locations (evolved from places to visit)
* ticket cameras (same as before)
* Garmin talk (evolved from open talk / POI help)
* other GPS brands (evolved from open talk / POI help)

These new categories should make it easier to find discussions for your area of interest / expertise.

Still to do -- I need to improve the formatting of discussion topics and posts to make them easier to read.

JM