Franz Wilhelmstötter

Implement some simple methods for doing some GPX cleanup, e.g. remove invalid points and add meta-information.

Do some experiments with reader/writer for different formats then GPX.

Let a `Point` be converted to and from a [Geohash](https://www.movable-type.co.uk/scripts/geohash.html).

If you make a bike tour, it is also interesting to calculate the traveled altitude difference. The difference in altitude can't be simply added up since the GPS altitude is...

It would be nice to have some (simple) algorithm which detects possible positioning errors. This would be helpful for correcting the GPS-Track taken during a bicycle by a standard GPS...

Add additional tests for geoid distance calculations.

It should be possible to store GPS data into a relational (JDBC) database.

The `DerivativeGenerator` obeys the weight of the rules when generating a _derivative tree_. See #889 #890

The extended `Cfg`object created in issue #889 allows to add annotations. In this ticket, the BNF format should be extended such that it is possible to such annotations in a...