LanguageMachines/frog: v0.16

This is the last release using pre FoLiA 2.0 It includes a total rework of the Frog Internals, aiming at better maintainability and hoping for a speedup and a smaller memory footprint. This work will continue in the upcoming release for FoLiA 2.0

Major Changes:

• total rework. Not using a FoLiA document as the internal datastructure anymore but a FrogData structure.
• use folia::engine for all FoLiA processing
• -Q option is NOT supported anymore. It was unreliable anyway
• builds on the newest ucto versions only
• fix for https://github.com/proycon/LaMachine/issues//135

      https://github.com/LanguageMachines/frog/issues/66
  

• handles some corner cases in FoLiA better
• lots of code cleanup
• numerous small fixes ( e.g. in NER and MBMA results)
• improved working of --languages option
• avoid invalid FoLiA: https://github.com/LanguageMachines/frog/issues/60
• fixed memory leaks
• better handling of weird FoLiA

[Maarten van Gompel]

• added skeleton for new Frog documentation