Increase the (root|lemma)_offset from 2^24 to 2^32.
Increase the (root|lemma)_offset from 2^24 to 2^32.

The increased limit allows loading larger dictionaries, while
requiring ~5-8% of additional memory.

Fixes #8.

ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita