septentrio: misc fixes

decode_glonav: correct svh. Only a binary health bit is wanted for the
GLONASS svh.

decode_galnav: correct code and health, convert to RINEX format.

decode_meas3Doppler, decode_meas3CN: correct loop oob

meas3_sig2idx: use MEAS3_SIG_MAX

decode_gpsrawcnav: add partial implementation

decode_galrawfnav: correct code

decode_galrawinav: correct code

decode_navicraw: enable

decode_naviclnav: enable

decode_cmpnav: correct times

decode_qzssnav: correct, enable

Set the eph.set even if it is zero, just to be explicit.