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MVT questions and improvements #25

Description

@nesnoj

In epp-app I increased the zoom range to 8-15 by setting

MAP_ENGINE_MIN_ZOOM = 8
MAP_ENGINE_MAX_ZOOM = 16

(btw, MAP_ENGINE_MAX_ZOOM always needs to be desired zoom level+1 which could be fixed..)

Now tiles are loaded for the former zoom range (8-12), in levels >12 no data is shown at all.
(1) Is it possible to use the tiles from zoom 12 for 13-15 as well?

So I distilled the entire range by setting MAP_ENGINE_MAX_DISTILLED_ZOOM = 15 but this takes ages. I just used --parallel-render [number of threads] for parallelization but unfortunately this does not seem to speed up the process. My testing conditions: [threads: 1/4/12, duration: 5 min, indicator: number of created files, total size].
(2) Any idea why this does not work? Have you used django-distill parallelization?

The file size increases vastly with increasing zoom level, even in 13 one tile amounts up to some MB.
(3) Is there a way to define simplification/generalization thresholds for the geoms to reduce the size?

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