GUI server auto start

FGLSERVER defaults the server defined by wsmap settings, when starting GUI server

Before version 2.30, the runtime system was trying to connect to localhost:0 when FGLSERVER was not set, even if gui.server.autostart FGLPROFILE entries are defined.

This behavior has been identified as a bug (FGL-1583) and has been fixed, changing the way fglrun proceeds with the GUI connection when autostart settings are defined; with 2.30, the wsmap workstation mappings are now taken into account, so that FGLSERVER defaults to locahost:n, where n is the GUI server number found from the wsmap settings.