v0.2.2 bugfix

- fixed error in XML output (apparently, clojure.xml handles parsing XML escape
  sequences, but doesn't handle correctly emitting them)
v0.2.3 bugfix

- fixed wrong assumption in trans-ver.eaf-check/alignment-of-ort-and-fon
  (annotation tiers need not have PARTICIPANT attributes, so searching for
  corresponding tiers using this property is unreliable; on the other hand, they
  are matchable via ort TIER_ID and fon PARENT_REF)