Fix direct loading of xware in coop

A superfluous unnamed info_player_start screwed up the info_coop_start
selection heuristic. It's unneeded in coop play, therefor remove it.
Quirk around xship spawnpoint problems in coop

In xship the coop spawnpoints are farther away from the
info_player_start than in other maps. Work around this by
adding a quirk to the quirk.
Update CHANGELOG for 2.0
Add a FAQ section to README