ground.xml reindent and use maxscale/minscale entities.
Max shield length 4 for Latvia/Lithuania support.
Indentation & whitespace fixes, use zoom-to-scale entities.
Skip useless background layers, use full detail coastlines for z9 & z10.

This may break layers other than osmapa.pl since the skipped layers
are only useless in conjuction with hillshade-thin.xml which overdraws
them anyway.
Use full-detail highways on z10, bigger motorway casings.
Indentation & whitespace fixes, use zoom-to-scale entities.
More data on z10: villages, bigger boundaries.