UFO:Alien Invasion Code

* use the trunk base content

* delete the base to allow to copy the trunk one

* Deleted some unchanges stuff after talk with mattn.

* tweak musical selection and make use of Psymong's new music tracks
* updated PsymongN3.ogg
* set ReplayGain values on all new music using vorbisgain
* client/cl_campaign.c fix typo causing segfault in gameload code (introduced in r4681)

* mission.ufo updated mission music definitions and added details for the estate mission
* menu_geoscape.ufo, seq_ingame.ufo, menu_lostwon.ufo, seq_credits.ufo, menu_main now use new music
* campaign.ufo add estate, spedition, pdi and falconcrash missions (falconcrash & spedition included to get feedback, testing and to prompt someone to finish them!)
* all music tracks have had gains automatically adjusted via the vorbisgain utility to attain some degree of normalization (note this does not affect the stream data, only a header field)

* Music tracks by Psymong (the new tracks and the updated old series)