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<h3>Generic map types
</h3>
<p>Here we have the general map types that are used to build the map.
Other data sources, such as the OSM reader, have to convert to
this format.
<p>Note that this is the most detailed representation of the map.
We use this intermediate form, because a Garmin map has (or can have)
different levels of zoom which will be at different levels of detail.
<p>So we go through this
<em>general
</em> representation to construct the
actual representations at each level. These actual representations will
use objects from the @{link uk.me.parabola.imgfmt.app} package, and
they may have a different number of points to this general representation.
Indeed they may have different points all together since we may take the
average of several points in the general representation
</p>
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