add GetAltRef() for flight plan compatibility with v5.2
v5.0.5_stable maintenance release

- fix field order in HFF_DBG message
- fix altitude in some extra nav routines
- fix create_module tool
- fix RCLost macro
- add GetAltRef() for flight plan compatibility with v5.2
forgot to update paparazzi_version for tarball
Merge branch 'v5.0' into skyw-fw