[communication] Creates the drivers for linux for new UART and Xbee libraries. WARNING : still not tested !
* Modifies Eclipse projects sb_debug_console and balise_principal.
* Updates their node_cfg.h.
* Creates lib_UART_framing_linux.[c,h] (drivers for UART framing).
* Deletes now useless linux drivers for Xbee.
* Creates a linux timeout library (timeout.[c,h]).