add hlds.py as console script 'hlds-converter' to setup.py
added new output option 'textplan-featstruct', renamed 'textplan' to 'textplan-xml'
hlds.py: put cli handling into main()
set version manually in sphinx conf (rtfd.org can't parse it otherwise)
Merge branch 'master' of https://github.com/arne-cl/pypolibox