added write and read functions to port.cpp
added main, about, open, options, and saveAs windows
(-) OpenFile/SaveAs working but needs improovements
(-) New cell renderers callbacks
Added connection with Gpredict !
Elevations and Azimuth labels now working
added new files for interpreter and manager of satellites
added default session and removed bugs for openning sessions
Commit of a pre-demo version for showing the custommer the actual state of the project