python: fix multiples problems with qipython (type conversion handling)
python: fix multiples problems with qipython (type conversion handling)

(still miss proper error handling)

bsautron/libqi,aldebaran/libqi-java,aldebaran/libqi,aldebaran/libqi,aldebaran/libqi,aldebaran/libqi-java,vbarbaresi/libqi,aldebaran/libqi-java