* Improvement: API allows to merge files (#1208)
  * Bug fix: exported SBML was not compliant with the standard when element
    name was empty (#1147)
  * Bug fix: flybase and pato annotations from CellDesigner were not picked
    (#1113)
  * Bug fix: invalid data overlays in uploaded zip file created "valid" project
    that could not be opened (#1086)
  * Bug fix: export to GPML preserves font color of compartments (#1111)
  * Bug fix: export to GPML preserves information about hypotetical complexes
    (#1111)
  * Bug fix: export to GPML preserves complex name (#1111)
  * Bug fix: export to GPML preserves reaction color (#1111)
  * Bug fix: modification residues are exported to gpml (#1111)
  * Bug fix: information about reaction reversibility is exported to gpml
    (#1111)
  * Bug fix: cardinality in SBGN-like view is drawn in separate unit (#1157)
  * Bug fix: notes from SBML are parsed with all html tags (#1196)
  * Bug fix: converter API append conversion warnings to generated output notes