Make starting IDs the max of every available source
Make starting IDs the max of every available source

Raveler superpixel map text files, images, and body map text files can
contain orphan or phantom entries that do not appear in the other
sources. Use the max of all available sources for each ID type to be
sure no collisions with orphan or phantom entries occur.

aschampion/special-scripts,jni/special-scripts