new way to enter station information to plot with its seedlink server.
./seedlink_plotter.py -b 3 -s "rtserver.ipgp.fr:18000#G_TAM:00BHZ"

the multi station is not yet working. It seems that at the begiging the seendlink clients
are strangely linked. When clients are getting in "real time", the seedlink clients seems
to work as supposed

The syntax for multistation is
./seedlink_plotter.py -b 3 -s "rtserver.ipgp.fr:18000#G_TAM:00BHZ" "rtserver.ipgp.fr:18000#G_SSB:00BHZ"