(1) add 3-panel and veritical-panel modes for RTKNAVI
(2) add sky image overlay to skyplot for RTKPLOT
(3) add pos2-bdsarmode for beidou amb-res option for RTKRCV and RNX2RTKP
(4) add beidou amb-res option for RTKNAVI and RTKPOST
(5) add option -a, -