ft857-arg-check:
- remove all checks for rig != NULL, these are done by the front end
ft857-squelch:
- add ft857_get_dcd() and ft857_get_level(RIG_LEVEL_SQLSTAT)
- changed S meter calculation a bit
- the rig rejects ft857_set_ptt() if state isn't changed,
handling this might be needed in other set commands as well
- increased read timeout a bit
- tried ft857_set_powerstat(), didn't work...
- minor cosmetic stuff
git-svn-id: https://hamlib.svn.sourceforge.net/svnroot/hamlib/trunk@1536 7ae35d74-ebe9-4afe-98af-79ac388436b8