Include hex error status bug from foxy branch

Last code associated with legacy v1 OSR, with ROS2 Foxy/Galactic/Humble

Last code associated with legacy v1 OSR, with ROS1 Melodic

Merge pull request #136 from Achllle/iss134_odomzerodiv

Fix #134 for ROS1, add warning

Merge pull request #17 from daniel-s-ingram/daniel-s-ingram/issue-5-p…

…ython3-support

Add support for Python3 while preserving Python2 compatibility