Folia

Minor fix in setup.py so it installs even when not on a proper utf-8 locale. (16)

* Fix for items() and added elements() (proycon/foliatools7)

Minor bugfix release:
* fixed bug with processor= keyword argument to ``Document class

* updated for FoLiA v2.2.1
* prevent adding a duplicate generator subprocessor
* relax parsing of the xref/type attribute (it's status as either mandatory or optional was unclear, so let's keep it optional)
* [FQL] implemented support for relations 11
* alias was not properly serialised on declarations (12)

* Implemented AbstractWord.alternativelayers() method and made findspans() able to handle alternative spans
* Various FQL improvements, mainly regarding alternative handling and revised AS ALTERNATIVE directive
* Allow set-holding and set-less declarations to co-exist (proycon/folia74)
* Expanded test suite

* Documentation updates
* Add a fix to the library to handle an automatically fix certain invalid FoLiA where an explicit processor attribute is missing on an annotation and no default can be assigned due to there being multiple possible processors/annotators (need to be explicitly enabled)