[CWB] CWB and CoNLL format

[Stefan Evert]

> On 3 Mar 2021, at 22:14, Stefan Evert <stefanML at collocations.de> wrote:
> 
> But thanks for the recommendations, I'll try to remember until I have time to work on the manual again.  I think I explained my understanding of "CoNLL-style format" in the manpages, but I completely agree that "full CoNLL support" in the encoding tutorial is misleading.

Support for CoNLL-style input and its limitations are now explained in much more detail in the encoding tutorial and the manpages.  This should no longer be misleading and also provides thorough documentation.

I've also implemented a few small improvements (CoNLL-style feature sets can be converted to CWB format) and added tests in CWB/Perl.

Best,
Stefan