Paintera conversion helper 0.10.0

Changelog

• Use relative paths to N5 container in label-to-block mapping when converting label multiset datasets.
• Allow to use existing s0 dataset as raw data input to skip conversion and only generate scale levels
• Removed deprecated paintera-conversion-helper command in favor of newer paintera-convert

Bug fixes

• Fix meshes not showing up in converted label datasets on Windows after converting on Janelia cluster #45
• Fix NullPointerException in Gson adapter initialization when running conversion on Janelia cluster #40
• Fix duplicate group name /data/data/ instead of just /data/ in label multiset converter